636772985740680 has 64 divisors (see below), whose sum is σ = 1938831180488640. Its totient is φ = 167271709684992.

The previous prime is 636772985740657. The next prime is 636772985740691. The reversal of 636772985740680 is 86047589277636.

It is a junction number, because it is equal to n+sod(n) for n = 636772985740596 and 636772985740605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39600302019 + ... + 39600318098.

It is an arithmetic number, because the mean of its divisors is an integer number (30294237195135).

Almost surely, 2^{636772985740680} is an apocalyptic number.

636772985740680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636772985740680 is an abundant number, since it is smaller than the sum of its proper divisors (1302058194747960).

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

636772985740680 is a wasteful number, since it uses less digits than its factorization.

636772985740680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79200620198 (or 79200620194 counting only the distinct ones).

The product of its (nonzero) digits is 5120962560, while the sum is 78.

The spelling of 636772985740680 in words is "six hundred thirty-six trillion, seven hundred seventy-two billion, nine hundred eighty-five million, seven hundred forty thousand, six hundred eighty".