649716657992 has 16 divisors (see below), whose sum is σ = 1218578035200. Its totient is φ = 324762515280.

The previous prime is 649716657983. The next prime is 649716658033. The reversal of 649716657992 is 299756617946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11947892 + ... + 12002147.

It is an arithmetic number, because the mean of its divisors is an integer number (76161127200).

Almost surely, 2^649716657992 is an apocalyptic number.

It is an amenable number.

649716657992 is a deficient number, since it is larger than the sum of its proper divisors (568861377208).

649716657992 is a wasteful number, since it uses less digits than its factorization.

649716657992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23953436 (or 23953432 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 71.

The spelling of 649716657992 in words is "six hundred forty-nine billion, seven hundred sixteen million, six hundred fifty-seven thousand, nine hundred ninety-two".