649806668554 has 16 divisors (see below), whose sum is σ = 978231931488. Its totient is φ = 323729541072.

The previous prime is 649806668513. The next prime is 649806668579. The reversal of 649806668554 is 455866608946.

It is a self number, because there is not a number n which added to its sum of digits gives 649806668554.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8495509 + ... + 8571655.

It is an arithmetic number, because the mean of its divisors is an integer number (61139495718).

Almost surely, 2^649806668554 is an apocalyptic number.

649806668554 is a deficient number, since it is larger than the sum of its proper divisors (328425262934).

649806668554 is a wasteful number, since it uses less digits than its factorization.

649806668554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91509.

The product of its (nonzero) digits is 298598400, while the sum is 67.

The spelling of 649806668554 in words is "six hundred forty-nine billion, eight hundred six million, six hundred sixty-eight thousand, five hundred fifty-four".