82694779457 has 2 divisors, whose sum is σ = 82694779458. Its totient is φ = 82694779456.

The previous prime is 82694779441. The next prime is 82694779477. The reversal of 82694779457 is 75497749628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78442565776 + 4252213681 = 280076^2 + 65209^2 .

It is a cyclic number.

It is not a de Polignac number, because 82694779457 - 2⁴ = 82694779441 is a prime.

It is not a weakly prime, because it can be changed into another prime (82694779477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41347389728 + 41347389729.

It is an arithmetic number, because the mean of its divisors is an integer number (41347389729).

Almost surely, 2^82694779457 is an apocalyptic number.

It is an amenable number.

82694779457 is a deficient number, since it is larger than the sum of its proper divisors (1).

82694779457 is an equidigital number, since it uses as much as digits as its factorization.

82694779457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 213373440, while the sum is 68.

The spelling of 82694779457 in words is "eighty-two billion, six hundred ninety-four million, seven hundred seventy-nine thousand, four hundred fifty-seven".