82155408697 has 2 divisors, whose sum is σ = 82155408698. Its totient is φ = 82155408696.

The previous prime is 82155408677. The next prime is 82155408763. The reversal of 82155408697 is 79680455128.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80397199936 + 1758208761 = 283544^2 + 41931^2 .

It is a cyclic number.

It is not a de Polignac number, because 82155408697 - 2²³ = 82147020089 is a prime.

It is a super-2 number, since 2×82155408697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82155408677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41077704348 + 41077704349.

It is an arithmetic number, because the mean of its divisors is an integer number (41077704349).

Almost surely, 2^82155408697 is an apocalyptic number.

It is an amenable number.

82155408697 is a deficient number, since it is larger than the sum of its proper divisors (1).

82155408697 is an equidigital number, since it uses as much as digits as its factorization.

82155408697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 82155408697 in words is "eighty-two billion, one hundred fifty-five million, four hundred eight thousand, six hundred ninety-seven".