51544931643 has 12 divisors (see below), whose sum is σ = 74827932400. Its totient is φ = 34190606736.

The previous prime is 51544931611. The next prime is 51544931653. The reversal of 51544931643 is 34613944515.

51544931643 is a `hidden beast` number, since 5 + 1 + 544 + 93 + 16 + 4 + 3 = 666.

It is not a de Polignac number, because 51544931643 - 2⁵ = 51544931611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51544931653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14388196 + ... + 14391777.

Almost surely, 2^51544931643 is an apocalyptic number.

51544931643 is a deficient number, since it is larger than the sum of its proper divisors (23283000757).

51544931643 is a wasteful number, since it uses less digits than its factorization.

51544931643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28780178 (or 28780175 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 51544931643 in words is "fifty-one billion, five hundred forty-four million, nine hundred thirty-one thousand, six hundred forty-three".