425116364821 has 2 divisors, whose sum is σ = 425116364822. Its totient is φ = 425116364820.

The previous prime is 425116364801. The next prime is 425116364851. The reversal of 425116364821 is 128463611524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309814692100 + 115301672721 = 556610^2 + 339561^2 .

It is a cyclic number.

It is not a de Polignac number, because 425116364821 - 2²⁵ = 425082810389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425116364801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212558182410 + 212558182411.

It is an arithmetic number, because the mean of its divisors is an integer number (212558182411).

Almost surely, 2^425116364821 is an apocalyptic number.

It is an amenable number.

425116364821 is a deficient number, since it is larger than the sum of its proper divisors (1).

425116364821 is an equidigital number, since it uses as much as digits as its factorization.

425116364821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 43.

The spelling of 425116364821 in words is "four hundred twenty-five billion, one hundred sixteen million, three hundred sixty-four thousand, eight hundred twenty-one".