20653345859257 has 2 divisors, whose sum is σ = 20653345859258. Its totient is φ = 20653345859256.

The previous prime is 20653345859233. The next prime is 20653345859273. The reversal of 20653345859257 is 75295854335602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13608270945721 + 7045074913536 = 3688939^2 + 2654256^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653345859257 - 2³⁹ = 20103590045369 is a prime.

It is not a weakly prime, because it can be changed into another prime (20653345859227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326672929628 + 10326672929629.

It is an arithmetic number, because the mean of its divisors is an integer number (10326672929629).

Almost surely, 2^{20653345859257} is an apocalyptic number.

It is an amenable number.

20653345859257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653345859257 is an equidigital number, since it uses as much as digits as its factorization.

20653345859257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160000, while the sum is 64.

The spelling of 20653345859257 in words is "twenty trillion, six hundred fifty-three billion, three hundred forty-five million, eight hundred fifty-nine thousand, two hundred fifty-seven".