82645553820 has 24 divisors (see below), whose sum is σ = 231407550864. Its totient is φ = 22038814336.

The previous prime is 82645553813. The next prime is 82645553917. The reversal of 82645553820 is 2835554628.

It is a self number, because there is not a number n which added to its sum of digits gives 82645553820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688712889 + ... + 688713008.

It is an arithmetic number, because the mean of its divisors is an integer number (9641981286).

Almost surely, 2^82645553820 is an apocalyptic number.

It is an amenable number.

82645553820 is an abundant number, since it is smaller than the sum of its proper divisors (148761997044).

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

82645553820 is a wasteful number, since it uses less digits than its factorization.

82645553820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377425909 (or 1377425907 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 82645553820 in words is "eighty-two billion, six hundred forty-five million, five hundred fifty-three thousand, eight hundred twenty".