663687297680 has 40 divisors (see below), whose sum is σ = 1683352329984. Its totient is φ = 241340835200.

The previous prime is 663687297673. The next prime is 663687297683. The reversal of 663687297680 is 86792786366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 663687297680.

It is not an unprimeable number, because it can be changed into a prime (663687297683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377094176 + ... + 377095935.

Almost surely, 2^663687297680 is an apocalyptic number.

It is an amenable number.

663687297680 is an abundant number, since it is smaller than the sum of its proper divisors (1019665032304).

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

663687297680 is a wasteful number, since it uses less digits than its factorization.

663687297680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754190135 (or 754190129 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 68.

The spelling of 663687297680 in words is "six hundred sixty-three billion, six hundred eighty-seven million, two hundred ninety-seven thousand, six hundred eighty".