425665550657 has 2 divisors, whose sum is σ = 425665550658. Its totient is φ = 425665550656.

The previous prime is 425665550603. The next prime is 425665550677. The reversal of 425665550657 is 756055566524.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343069089841 + 82596460816 = 585721^2 + 287396^2 .

It is a cyclic number.

It is not a de Polignac number, because 425665550657 - 2¹⁰ = 425665549633 is a prime.

It is a super-2 number, since 2×425665550657² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (425665550677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212832775328 + 212832775329.

It is an arithmetic number, because the mean of its divisors is an integer number (212832775329).

Almost surely, 2^425665550657 is an apocalyptic number.

It is an amenable number.

425665550657 is a deficient number, since it is larger than the sum of its proper divisors (1).

425665550657 is an equidigital number, since it uses as much as digits as its factorization.

425665550657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800000, while the sum is 56.

The spelling of 425665550657 in words is "four hundred twenty-five billion, six hundred sixty-five million, five hundred fifty thousand, six hundred fifty-seven".