51555697038 has 48 divisors (see below), whose sum is σ = 113764131936. Its totient is φ = 16870371840.

The previous prime is 51555697033. The next prime is 51555697043. The reversal of 51555697038 is 83079655515.

51555697038 is a `hidden beast` number, since 5 + 1 + 5 + 5 + 569 + 70 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (51555697033) and next prime (51555697043).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555697033) 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, 211206 + ... + 384342.

It is an arithmetic number, because the mean of its divisors is an integer number (2370086082).

Almost surely, 2^51555697038 is an apocalyptic number.

51555697038 is an abundant number, since it is smaller than the sum of its proper divisors (62208434898).

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

51555697038 is a wasteful number, since it uses less digits than its factorization.

51555697038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173449 (or 173446 counting only the distinct ones).

The product of its (nonzero) digits is 5670000, while the sum is 54.

The spelling of 51555697038 in words is "fifty-one billion, five hundred fifty-five million, six hundred ninety-seven thousand, thirty-eight".