649913894245 has 128 divisors (see below), whose sum is σ = 1013922201600. Its totient is φ = 388177920000.

The previous prime is 649913894239. The next prime is 649913894317. The reversal of 649913894245 is 542498319946.

It is not a de Polignac number, because 649913894245 - 2¹¹ = 649913892197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 845141221 + ... + 845141989.

It is an arithmetic number, because the mean of its divisors is an integer number (7921267200).

Almost surely, 2^649913894245 is an apocalyptic number.

It is an amenable number.

649913894245 is a deficient number, since it is larger than the sum of its proper divisors (364008307355).

649913894245 is a wasteful number, since it uses less digits than its factorization.

649913894245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659.

The product of its digits is 67184640, while the sum is 64.

The spelling of 649913894245 in words is "six hundred forty-nine billion, nine hundred thirteen million, eight hundred ninety-four thousand, two hundred forty-five".