425673260821 has 2 divisors, whose sum is σ = 425673260822. Its totient is φ = 425673260820.

The previous prime is 425673260819. The next prime is 425673260839. The reversal of 425673260821 is 128062376524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225448334596 + 200224926225 = 474814^2 + 447465^2 .

It is a cyclic number.

It is not a de Polignac number, because 425673260821 - 2¹ = 425673260819 is a prime.

Together with 425673260819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425673260801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212836630410 + 212836630411.

It is an arithmetic number, because the mean of its divisors is an integer number (212836630411).

Almost surely, 2^425673260821 is an apocalyptic number.

It is an amenable number.

425673260821 is a deficient number, since it is larger than the sum of its proper divisors (1).

425673260821 is an equidigital number, since it uses as much as digits as its factorization.

425673260821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 425673260821 in words is "four hundred twenty-five billion, six hundred seventy-three million, two hundred sixty thousand, eight hundred twenty-one".