2564515300421 has 2 divisors, whose sum is σ = 2564515300422. Its totient is φ = 2564515300420.

The previous prime is 2564515300397. The next prime is 2564515300427. The reversal of 2564515300421 is 1240035154652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1814446716196 + 750068584225 = 1347014^2 + 866065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2564515300421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2564515300427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282257650210 + 1282257650211.

It is an arithmetic number, because the mean of its divisors is an integer number (1282257650211).

Almost surely, 2^{2564515300421} is an apocalyptic number.

It is an amenable number.

2564515300421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564515300421 is an equidigital number, since it uses as much as digits as its factorization.

2564515300421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 2564515300421 in words is "two trillion, five hundred sixty-four billion, five hundred fifteen million, three hundred thousand, four hundred twenty-one".