82565640220 has 24 divisors (see below), whose sum is σ = 198157536864. Its totient is φ = 28308219456.

The previous prime is 82565640187. The next prime is 82565640221. The reversal of 82565640220 is 2204656528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82565640221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294877147 + ... + 294877426.

It is an arithmetic number, because the mean of its divisors is an integer number (8256564036).

Almost surely, 2^82565640220 is an apocalyptic number.

It is an amenable number.

82565640220 is an abundant number, since it is smaller than the sum of its proper divisors (115591896644).

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

82565640220 is a wasteful number, since it uses less digits than its factorization.

82565640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589754589 (or 589754587 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 82565640220 in words is "eighty-two billion, five hundred sixty-five million, six hundred forty thousand, two hundred twenty".