51215353501 has 24 divisors (see below), whose sum is σ = 59715740160. Its totient is φ = 43740493056.

The previous prime is 51215353493. The next prime is 51215353529. The reversal of 51215353501 is 10535351215.

It is not a de Polignac number, because 51215353501 - 2³ = 51215353493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215353601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18436 + ... + 320578.

It is an arithmetic number, because the mean of its divisors is an integer number (2488155840).

Almost surely, 2^51215353501 is an apocalyptic number.

It is an amenable number.

51215353501 is a deficient number, since it is larger than the sum of its proper divisors (8500386659).

51215353501 is a wasteful number, since it uses less digits than its factorization.

51215353501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302245 (or 302232 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 51215353501 in words is "fifty-one billion, two hundred fifteen million, three hundred fifty-three thousand, five hundred one".