649361681300 has 36 divisors (see below), whose sum is σ = 1409448969180. Its totient is φ = 259683083520.

The previous prime is 649361681299. The next prime is 649361681323. The reversal of 649361681300 is 3186163946.

It can be written as a sum of positive squares in 6 ways, for example, as 33444362884 + 615917318416 = 182878^2 + 784804^2 .

It is a congruent number.

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, 344849 + ... + 1190648.

It is an arithmetic number, because the mean of its divisors is an integer number (39151360255).

Almost surely, 2^649361681300 is an apocalyptic number.

It is an amenable number.

649361681300 is an abundant number, since it is smaller than the sum of its proper divisors (760087287880).

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

649361681300 is a wasteful number, since it uses less digits than its factorization.

649361681300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539740 (or 1539733 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 649361681300 in words is "six hundred forty-nine billion, three hundred sixty-one million, six hundred eighty-one thousand, three hundred".