5121551556 has 144 divisors (see below), whose sum is σ = 14448732480. Its totient is φ = 1516584960.

The previous prime is 5121551551. The next prime is 5121551573. The reversal of 5121551556 is 6551551215.

5121551556 is a `hidden beast` number, since 51 + 2 + 1 + 5 + 51 + 556 = 666.

It is a super-2 number, since 2×5121551556² = 52460580681532042272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 5121551556.

It is not an unprimeable number, because it can be changed into a prime (5121551551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3634180 + ... + 3635588.

It is an arithmetic number, because the mean of its divisors is an integer number (100338420).

Almost surely, 2^5121551556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5121551556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7224366240).

5121551556 is an abundant number, since it is smaller than the sum of its proper divisors (9327180924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5121551556 is a wasteful number, since it uses less digits than its factorization.

5121551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1629 counting only the distinct ones).

The product of its digits is 37500, while the sum is 36.

The square root of 5121551556 is about 71565.0162858921. The cubic root of 5121551556 is about 1723.7218347583.

The spelling of 5121551556 in words is "five billion, one hundred twenty-one million, five hundred fifty-one thousand, five hundred fifty-six".