20257553695139 has 2 divisors, whose sum is σ = 20257553695140. Its totient is φ = 20257553695138.

The previous prime is 20257553695117. The next prime is 20257553695187. The reversal of 20257553695139 is 93159635575202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20257553695139 - 2²⁰ = 20257552646563 is a prime.

It is a super-2 number, since 2×20257553695139² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20257553698139) 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 as a sum of consecutive naturals, namely, 10128776847569 + 10128776847570.

It is an arithmetic number, because the mean of its divisors is an integer number (10128776847570).

Almost surely, 2^{20257553695139} is an apocalyptic number.

20257553695139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257553695139 is an equidigital number, since it uses as much as digits as its factorization.

20257553695139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545000, while the sum is 62.

The spelling of 20257553695139 in words is "twenty trillion, two hundred fifty-seven billion, five hundred fifty-three million, six hundred ninety-five thousand, one hundred thirty-nine".