51693918507 has 144 divisors (see below), whose sum is σ = 100371631360. Its totient is φ = 25019280000.

The previous prime is 51693918491. The next prime is 51693918511. The reversal of 51693918507 is 70581939615.

It is not a de Polignac number, because 51693918507 - 2⁴ = 51693918491 is a prime.

It is a super-2 number, since 2×51693918507² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51693918517) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8832132 + ... + 8837982.

Almost surely, 2^51693918507 is an apocalyptic number.

51693918507 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

51693918507 is a deficient number, since it is larger than the sum of its proper divisors (48677712853).

51693918507 is a wasteful number, since it uses less digits than its factorization.

51693918507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966 (or 5952 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 51693918507 in words is "fifty-one billion, six hundred ninety-three million, nine hundred eighteen thousand, five hundred seven".