51537866428 has 6 divisors (see below), whose sum is σ = 90191266256. Its totient is φ = 25768933212.

The previous prime is 51537866357. The next prime is 51537866437. The reversal of 51537866428 is 82466873515.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6442233300 + ... + 6442233307.

Almost surely, 2^51537866428 is an apocalyptic number.

It is an amenable number.

51537866428 is a deficient number, since it is larger than the sum of its proper divisors (38653399828).

51537866428 is a wasteful number, since it uses less digits than its factorization.

51537866428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12884466611 (or 12884466609 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 55.

The spelling of 51537866428 in words is "fifty-one billion, five hundred thirty-seven million, eight hundred sixty-six thousand, four hundred twenty-eight".