51431111545 has 64 divisors (see below), whose sum is σ = 71033760000. Its totient is φ = 35400601600.

The previous prime is 51431111527. The next prime is 51431111561. The reversal of 51431111545 is 54511113415.

It is not a de Polignac number, because 51431111545 - 2²¹ = 51429014393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49028181 + ... + 49029229.

It is an arithmetic number, because the mean of its divisors is an integer number (1109902500).

Almost surely, 2^51431111545 is an apocalyptic number.

51431111545 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51431111545 is a deficient number, since it is larger than the sum of its proper divisors (19602648455).

51431111545 is a wasteful number, since it uses less digits than its factorization.

51431111545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674.

The product of its digits is 6000, while the sum is 31.

The spelling of 51431111545 in words is "fifty-one billion, four hundred thirty-one million, one hundred eleven thousand, five hundred forty-five".