51997569356 has 12 divisors (see below), whose sum is σ = 91028392560. Its totient is φ = 25989457200.

The previous prime is 51997569347. The next prime is 51997569391. The reversal of 51997569356 is 65396579915.

51997569356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51997569292 and 51997569301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319320 + ... + 2341631.

It is an arithmetic number, because the mean of its divisors is an integer number (7585699380).

Almost surely, 2^51997569356 is an apocalyptic number.

It is an amenable number.

51997569356 is a deficient number, since it is larger than the sum of its proper divisors (39030823204).

51997569356 is a wasteful number, since it uses less digits than its factorization.

51997569356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663744 (or 4663742 counting only the distinct ones).

The product of its digits is 68890500, while the sum is 65.

The spelling of 51997569356 in words is "fifty-one billion, nine hundred ninety-seven million, five hundred sixty-nine thousand, three hundred fifty-six".