82646668640 has 24 divisors (see below), whose sum is σ = 195252755040. Its totient is φ = 33058667392.

The previous prime is 82646668619. The next prime is 82646668661. The reversal of 82646668640 is 4686664628.

It is an interprime number because it is at equal distance from previous prime (82646668619) and next prime (82646668661).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258270680 + ... + 258270999.

It is an arithmetic number, because the mean of its divisors is an integer number (8135531460).

Almost surely, 2^82646668640 is an apocalyptic number.

82646668640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

82646668640 is an abundant number, since it is smaller than the sum of its proper divisors (112606086400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82646668640 is a wasteful number, since it uses less digits than its factorization.

82646668640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516541694 (or 516541686 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 56.

The spelling of 82646668640 in words is "eighty-two billion, six hundred forty-six million, six hundred sixty-eight thousand, six hundred forty".