55511651520 has 1008 divisors, whose sum is σ = 223226875872. Its totient is φ = 12572098560.

The previous prime is 55511651509. The next prime is 55511651521. The reversal of 55511651520 is 2515611555.

55511651520 is a `hidden beast` number, since 5 + 5 + 5 + 116 + 515 + 20 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (55511651521) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1290968619 + ... + 1290968661.

It is an arithmetic number, because the mean of its divisors is an integer number (221455234).

Almost surely, 2^55511651520 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 55511651520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111613437936).

55511651520 is an abundant number, since it is smaller than the sum of its proper divisors (167715224352).

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

55511651520 is a wasteful number, since it uses less digits than its factorization.

55511651520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 136 counting only the distinct ones).

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

The spelling of 55511651520 in words is "fifty-five billion, five hundred eleven million, six hundred fifty-one thousand, five hundred twenty".