51545515504 has 60 divisors (see below), whose sum is σ = 116248512744. Its totient is φ = 22076890752.

The previous prime is 51545515451. The next prime is 51545515531. The reversal of 51545515504 is 40551554515.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1263327 + ... + 1303489.

Almost surely, 2^51545515504 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 51545515504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58124256372).

51545515504 is an abundant number, since it is smaller than the sum of its proper divisors (64702997240).

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

51545515504 is a wasteful number, since it uses less digits than its factorization.

51545515504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41822 (or 41809 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 51545515504 in words is "fifty-one billion, five hundred forty-five million, five hundred fifteen thousand, five hundred four".