649515515946 has 24 divisors (see below), whose sum is σ = 1427860557312. Its totient is φ = 196822883400.

The previous prime is 649515515819. The next prime is 649515515951.

It is a happy number.

649515515946 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 649515515946.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447324010 + ... + 447325461.

It is an arithmetic number, because the mean of its divisors is an integer number (59494189888).

Almost surely, 2^649515515946 is an apocalyptic number.

649515515946 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

649515515946 is an abundant number, since it is smaller than the sum of its proper divisors (778345041366).

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

649515515946 is a wasteful number, since it uses less digits than its factorization.

649515515946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894649498 (or 894649487 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 60.

The spelling of 649515515946 in words is "six hundred forty-nine billion, five hundred fifteen million, five hundred fifteen thousand, nine hundred forty-six".