649680164960 has 96 divisors (see below), whose sum is σ = 1587171311712. Its totient is φ = 251163095040.

The previous prime is 649680164933. The next prime is 649680164977. The reversal of 649680164960 is 69461086946.

It is a self number, because there is not a number n which added to its sum of digits gives 649680164960.

It is a congruent number.

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, 3581 + ... + 1139900.

It is an arithmetic number, because the mean of its divisors is an integer number (16533034497).

Almost surely, 2^649680164960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649680164960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793585655856).

649680164960 is an abundant number, since it is smaller than the sum of its proper divisors (937491146752).

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

649680164960 is a wasteful number, since it uses less digits than its factorization.

649680164960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143616 (or 1143608 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 59.

The spelling of 649680164960 in words is "six hundred forty-nine billion, six hundred eighty million, one hundred sixty-four thousand, nine hundred sixty".