51504557652 has 72 divisors (see below), whose sum is σ = 130677490944. Its totient is φ = 17104280256.

The previous prime is 51504557651. The next prime is 51504557659. The reversal of 51504557652 is 25675540515.

It is a junction number, because it is equal to n+sod(n) for n = 51504557598 and 51504557607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504557651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21255313 + ... + 21257735.

It is an arithmetic number, because the mean of its divisors is an integer number (1814965152).

Almost surely, 2^51504557652 is an apocalyptic number.

It is an amenable number.

51504557652 is an abundant number, since it is smaller than the sum of its proper divisors (79172933292).

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

51504557652 is a wasteful number, since it uses less digits than its factorization.

51504557652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389 (or 4384 counting only the distinct ones).

The product of its (nonzero) digits is 1050000, while the sum is 45.

The spelling of 51504557652 in words is "fifty-one billion, five hundred four million, five hundred fifty-seven thousand, six hundred fifty-two".