20315661611 has 12 divisors (see below), whose sum is σ = 23719724640. Its totient is φ = 17349156720.

The previous prime is 20315661607. The next prime is 20315661647. The reversal of 20315661611 is 11616651302.

It is not a de Polignac number, because 20315661611 - 2² = 20315661607 is a prime.

It is a super-2 number, since 2×20315661611² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315661601) 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, 751676 + ... + 778233.

It is an arithmetic number, because the mean of its divisors is an integer number (1976643720).

Almost surely, 2^20315661611 is an apocalyptic number.

20315661611 is a deficient number, since it is larger than the sum of its proper divisors (3404063029).

20315661611 is a wasteful number, since it uses less digits than its factorization.

20315661611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530194 (or 1530187 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 20315661611 in words is "twenty billion, three hundred fifteen million, six hundred sixty-one thousand, six hundred eleven".