51697569838 has 64 divisors (see below), whose sum is σ = 83923646400. Its totient is φ = 23834603520.

The previous prime is 51697569727. The next prime is 51697569839. The reversal of 51697569838 is 83896579615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51697569839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55648158 + ... + 55649086.

It is an arithmetic number, because the mean of its divisors is an integer number (1311306975).

Almost surely, 2^51697569838 is an apocalyptic number.

51697569838 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51697569838 is a deficient number, since it is larger than the sum of its proper divisors (32226076562).

51697569838 is a wasteful number, since it uses less digits than its factorization.

51697569838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477.

The product of its digits is 97977600, while the sum is 67.

The spelling of 51697569838 in words is "fifty-one billion, six hundred ninety-seven million, five hundred sixty-nine thousand, eight hundred thirty-eight".