20571096961 has 2 divisors, whose sum is σ = 20571096962. Its totient is φ = 20571096960.

The previous prime is 20571096919. The next prime is 20571097051. The reversal of 20571096961 is 16969017502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11485194561 + 9085902400 = 107169^2 + 95320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20571096961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20571096061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10285548480 + 10285548481.

It is an arithmetic number, because the mean of its divisors is an integer number (10285548481).

Almost surely, 2^20571096961 is an apocalyptic number.

It is an amenable number.

20571096961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20571096961 is an equidigital number, since it uses as much as digits as its factorization.

20571096961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 20571096961 in words is "twenty billion, five hundred seventy-one million, ninety-six thousand, nine hundred sixty-one".