51020635917 has 16 divisors (see below), whose sum is σ = 70569360000. Its totient is φ = 32749370304.

The previous prime is 51020635901. The next prime is 51020635921. The reversal of 51020635917 is 71953602015.

It is not a de Polignac number, because 51020635917 - 2⁴ = 51020635901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020635927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785542 + ... + 848007.

It is an arithmetic number, because the mean of its divisors is an integer number (4410585000).

Almost surely, 2^51020635917 is an apocalyptic number.

It is an amenable number.

51020635917 is a deficient number, since it is larger than the sum of its proper divisors (19548724083).

51020635917 is a wasteful number, since it uses less digits than its factorization.

51020635917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633940.

The product of its (nonzero) digits is 56700, while the sum is 39.

The spelling of 51020635917 in words is "fifty-one billion, twenty million, six hundred thirty-five thousand, nine hundred seventeen".