51544736891 has 32 divisors (see below), whose sum is σ = 57309120000. Its totient is φ = 46140019200.

The previous prime is 51544736879. The next prime is 51544736897. The reversal of 51544736891 is 19863744515.

It is a cyclic number.

It is not a de Polignac number, because 51544736891 - 2⁶ = 51544736827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51544736897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18748985 + ... + 18751733.

It is an arithmetic number, because the mean of its divisors is an integer number (1790910000).

Almost surely, 2^51544736891 is an apocalyptic number.

51544736891 is a deficient number, since it is larger than the sum of its proper divisors (5764383109).

51544736891 is a wasteful number, since it uses less digits than its factorization.

51544736891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299.

The product of its digits is 3628800, while the sum is 53.

The spelling of 51544736891 in words is "fifty-one billion, five hundred forty-four million, seven hundred thirty-six thousand, eight hundred ninety-one".