82558965421 has 2 divisors, whose sum is σ = 82558965422. Its totient is φ = 82558965420.

The previous prime is 82558965413. The next prime is 82558965469. The reversal of 82558965421 is 12456985528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75701469321 + 6857496100 = 275139^2 + 82810^2 .

It is a cyclic number.

It is not a de Polignac number, because 82558965421 - 2³ = 82558965413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82558969421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41279482710 + 41279482711.

It is an arithmetic number, because the mean of its divisors is an integer number (41279482711).

Almost surely, 2^82558965421 is an apocalyptic number.

It is an amenable number.

82558965421 is a deficient number, since it is larger than the sum of its proper divisors (1).

82558965421 is an equidigital number, since it uses as much as digits as its factorization.

82558965421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912000, while the sum is 55.

The spelling of 82558965421 in words is "eighty-two billion, five hundred fifty-eight million, nine hundred sixty-five thousand, four hundred twenty-one".