649499923584 has 96 divisors (see below), whose sum is σ = 1869655823100. Its totient is φ = 216424433664.

The previous prime is 649499923577. The next prime is 649499923607. The reversal of 649499923584 is 485329994946.

649499923584 is a `hidden beast` number, since 6 + 49 + 499 + 92 + 3 + 5 + 8 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 585959630400 + 63540293184 = 765480^2 + 252072^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3254262 + ... + 3448074.

Almost surely, 2^649499923584 is an apocalyptic number.

649499923584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649499923584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934827911550).

649499923584 is an abundant number, since it is smaller than the sum of its proper divisors (1220155899516).

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

649499923584 is a wasteful number, since it uses less digits than its factorization.

649499923584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196742 (or 196727 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 72.

The spelling of 649499923584 in words is "six hundred forty-nine billion, four hundred ninety-nine million, nine hundred twenty-three thousand, five hundred eighty-four".