20611162513 has 12 divisors (see below), whose sum is σ = 21789964548. Its totient is φ = 19493233920.

The previous prime is 20611162493. The next prime is 20611162543. The reversal of 20611162513 is 31526111602.

It can be written as a sum of positive squares in 2 ways, for example, as 11047691664 + 9563470849 = 105108^2 + 97793^2 .

It is not a de Polignac number, because 20611162513 - 2²⁵ = 20577608081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20611162543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165933 + ... + 262213.

It is an arithmetic number, because the mean of its divisors is an integer number (1815830379).

Almost surely, 2^20611162513 is an apocalyptic number.

It is an amenable number.

20611162513 is a deficient number, since it is larger than the sum of its proper divisors (1178802035).

20611162513 is an equidigital number, since it uses as much as digits as its factorization.

20611162513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96912 (or 96893 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 20611162513 in words is "twenty billion, six hundred eleven million, one hundred sixty-two thousand, five hundred thirteen".