649129775172 has 12 divisors (see below), whose sum is σ = 1514636142096. Its totient is φ = 216376591720.

The previous prime is 649129775167. The next prime is 649129775207. The reversal of 649129775172 is 271577921946.

It is a tau number, because it is divible by the number of its divisors (12).

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, 27047073954 + ... + 27047073977.

It is an arithmetic number, because the mean of its divisors is an integer number (126219678508).

Almost surely, 2^649129775172 is an apocalyptic number.

It is an amenable number.

649129775172 is an abundant number, since it is smaller than the sum of its proper divisors (865506366924).

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

649129775172 is a wasteful number, since it uses less digits than its factorization.

649129775172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54094147938 (or 54094147936 counting only the distinct ones).

The product of its digits is 13335840, while the sum is 60.

The spelling of 649129775172 in words is "six hundred forty-nine billion, one hundred twenty-nine million, seven hundred seventy-five thousand, one hundred seventy-two".