20051345145257 has 2 divisors, whose sum is σ = 20051345145258. Its totient is φ = 20051345145256.

The previous prime is 20051345145233. The next prime is 20051345145371. The reversal of 20051345145257 is 75254154315002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15776061104281 + 4275284040976 = 3971909^2 + 2067676^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051345145257 - 2¹² = 20051345141161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20051345145157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025672572628 + 10025672572629.

It is an arithmetic number, because the mean of its divisors is an integer number (10025672572629).

Almost surely, 2^{20051345145257} is an apocalyptic number.

It is an amenable number.

20051345145257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051345145257 is an equidigital number, since it uses as much as digits as its factorization.

20051345145257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840000, while the sum is 44.

The spelling of 20051345145257 in words is "twenty trillion, fifty-one billion, three hundred forty-five million, one hundred forty-five thousand, two hundred fifty-seven".