51697569880 has 32 divisors (see below), whose sum is σ = 126894036240. Its totient is φ = 18799116160.

The previous prime is 51697569839. The next prime is 51697569887. The reversal of 51697569880 is 8896579615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51697569887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 58746799 + ... + 58747678.

Almost surely, 2^51697569880 is an apocalyptic number.

It is an amenable number.

51697569880 is an abundant number, since it is smaller than the sum of its proper divisors (75196466360).

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

51697569880 is a wasteful number, since it uses less digits than its factorization.

51697569880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117494499 (or 117494495 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 51697569880 in words is "fifty-one billion, six hundred ninety-seven million, five hundred sixty-nine thousand, eight hundred eighty".