649812666988 has 12 divisors (see below), whose sum is σ = 1138505317600. Its totient is φ = 324525433392.

The previous prime is 649812666983. The next prime is 649812667037. The reversal of 649812666988 is 889666218946.

It is a self number, because there is not a number n which added to its sum of digits gives 649812666988.

It is not an unprimeable number, because it can be changed into a prime (649812666983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95221188 + ... + 95228011.

Almost surely, 2^649812666988 is an apocalyptic number.

It is an amenable number.

649812666988 is a deficient number, since it is larger than the sum of its proper divisors (488692650612).

649812666988 is a wasteful number, since it uses less digits than its factorization.

649812666988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190450056 (or 190450054 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 73.

The spelling of 649812666988 in words is "six hundred forty-nine billion, eight hundred twelve million, six hundred sixty-six thousand, nine hundred eighty-eight".