51849915081 has 16 divisors (see below), whose sum is σ = 73692979200. Its totient is φ = 32332789008.

The previous prime is 51849915049. The next prime is 51849915133. The reversal of 51849915081 is 18051994815.

It is not a de Polignac number, because 51849915081 - 2⁵ = 51849915049 is a prime.

It is a super-2 number, since 2×51849915081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51849915031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5752761 + ... + 5761766.

It is an arithmetic number, because the mean of its divisors is an integer number (4605811200).

Almost surely, 2^51849915081 is an apocalyptic number.

It is an amenable number.

51849915081 is a deficient number, since it is larger than the sum of its proper divisors (21843064119).

51849915081 is a wasteful number, since it uses less digits than its factorization.

51849915081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11514628.

The product of its (nonzero) digits is 518400, while the sum is 51.

The spelling of 51849915081 in words is "fifty-one billion, eight hundred forty-nine million, nine hundred fifteen thousand, eighty-one".