649572666 has 16 divisors (see below), whose sum is σ = 1334257824. Its totient is φ = 210672144.

The previous prime is 649572661. The next prime is 649572673. The reversal of 649572666 is 666275946.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (649572661) 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 7 ways as a sum of consecutive naturals, for example, 1462780 + ... + 1463223.

It is an arithmetic number, because the mean of its divisors is an integer number (83391114).

Almost surely, 2^649572666 is an apocalyptic number.

649572666 is an abundant number, since it is smaller than the sum of its proper divisors (684685158).

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

649572666 is a wasteful number, since it uses less digits than its factorization.

649572666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926045.

The product of its digits is 3265920, while the sum is 51.

The square root of 649572666 is about 25486.7154808147. The cubic root of 649572666 is about 866.0492312007.

The spelling of 649572666 in words is "six hundred forty-nine million, five hundred seventy-two thousand, six hundred sixty-six".