649164865536 has 660 divisors, whose sum is σ = 2159289989304. Its totient is φ = 193491763200.

The previous prime is 649164865513. The next prime is 649164865561. The reversal of 649164865536 is 635568461946.

649164865536 is a `hidden beast` number, since 6 + 4 + 9 + 16 + 4 + 86 + 5 + 536 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 10642046946 + ... + 10642047006.

Almost surely, 2^649164865536 is an apocalyptic number.

649164865536 is a gapful number since it is divisible by the number (66) 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 649164865536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079644994652).

649164865536 is an abundant number, since it is smaller than the sum of its proper divisors (1510125123768).

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

649164865536 is an frugal number, since it uses more digits than its factorization.

649164865536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 77 counting only the distinct ones).

The product of its digits is 111974400, while the sum is 63.

The spelling of 649164865536 in words is "six hundred forty-nine billion, one hundred sixty-four million, eight hundred sixty-five thousand, five hundred thirty-six".