51437989685 has 32 divisors (see below), whose sum is σ = 65295605760. Its totient is φ = 38792271168.

The previous prime is 51437989679. The next prime is 51437989693. The reversal of 51437989685 is 58698973415.

It is a cyclic number.

It is not a de Polignac number, because 51437989685 - 2⁶ = 51437989621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24001724 + ... + 24003866.

It is an arithmetic number, because the mean of its divisors is an integer number (2040487680).

Almost surely, 2^51437989685 is an apocalyptic number.

It is an amenable number.

51437989685 is a deficient number, since it is larger than the sum of its proper divisors (13857616075).

51437989685 is a wasteful number, since it uses less digits than its factorization.

51437989685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297.

The product of its digits is 65318400, while the sum is 65.

The spelling of 51437989685 in words is "fifty-one billion, four hundred thirty-seven million, nine hundred eighty-nine thousand, six hundred eighty-five".