649565637 has 16 divisors (see below), whose sum is σ = 1006042752. Its totient is φ = 365094720.

The previous prime is 649565629. The next prime is 649565639. The reversal of 649565637 is 736565946.

It is a happy number.

It is not a de Polignac number, because 649565637 - 2³ = 649565629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649565637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649565639) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 252258 + ... + 254819.

It is an arithmetic number, because the mean of its divisors is an integer number (62877672).

Almost surely, 2^649565637 is an apocalyptic number.

It is an amenable number.

649565637 is a deficient number, since it is larger than the sum of its proper divisors (356477115).

649565637 is a wasteful number, since it uses less digits than its factorization.

649565637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507148.

The product of its digits is 4082400, while the sum is 51.

The square root of 649565637 is about 25486.5775850741. The cubic root of 649565637 is about 866.0461073613.

The spelling of 649565637 in words is "six hundred forty-nine million, five hundred sixty-five thousand, six hundred thirty-seven".