20652512661 has 96 divisors (see below), whose sum is σ = 35229841920. Its totient is φ = 11536358400.

The previous prime is 20652512653. The next prime is 20652512663. The reversal of 20652512661 is 16621525602.

20652512661 is a `hidden beast` number, since 2 + 0 + 6 + 525 + 126 + 6 + 1 = 666.

It is not a de Polignac number, because 20652512661 - 2³ = 20652512653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20652512663) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5530551 + ... + 5534283.

It is an arithmetic number, because the mean of its divisors is an integer number (366977520).

Almost surely, 2^20652512661 is an apocalyptic number.

It is an amenable number.

20652512661 is a deficient number, since it is larger than the sum of its proper divisors (14577329259).

20652512661 is a wasteful number, since it uses less digits than its factorization.

20652512661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3867 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 20652512661 in words is "twenty billion, six hundred fifty-two million, five hundred twelve thousand, six hundred sixty-one".