20527700661 has 48 divisors (see below), whose sum is σ = 32546033520. Its totient is φ = 12391833600.

The previous prime is 20527700659. The next prime is 20527700693. The reversal of 20527700661 is 16600772502.

20527700661 is a `hidden beast` number, since 2 + 0 + 527 + 70 + 0 + 6 + 61 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1821667761 + 18706032900 = 42681^2 + 136770^2 .

It is not a de Polignac number, because 20527700661 - 2¹ = 20527700659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20527700161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1280085 + ... + 1296021.

It is an arithmetic number, because the mean of its divisors is an integer number (678042365).

Almost surely, 2^20527700661 is an apocalyptic number.

It is an amenable number.

20527700661 is a deficient number, since it is larger than the sum of its proper divisors (12018332859).

20527700661 is a wasteful number, since it uses less digits than its factorization.

20527700661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16166 (or 16163 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 20527700661 in words is "twenty billion, five hundred twenty-seven million, seven hundred thousand, six hundred sixty-one".