51612311550 has 96 divisors (see below), whose sum is σ = 135126172800. Its totient is φ = 13001074560.

The previous prime is 51612311533. The next prime is 51612311551. The reversal of 51612311550 is 5511321615.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51612311551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 962856 + ... + 1015044.

It is an arithmetic number, because the mean of its divisors is an integer number (1407564300).

Almost surely, 2^51612311550 is an apocalyptic number.

51612311550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51612311550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67563086400).

51612311550 is an abundant number, since it is smaller than the sum of its proper divisors (83513861250).

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

51612311550 is a wasteful number, since it uses less digits than its factorization.

51612311550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52570 (or 52565 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 51612311550 in words is "fifty-one billion, six hundred twelve million, three hundred eleven thousand, five hundred fifty".