666526464 has 54 divisors (see below), whose sum is σ = 1921766756. Its totient is φ = 222174720.

The previous prime is 666526457. The next prime is 666526477. The reversal of 666526464 is 464625666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142342 + ... + 146949.

Almost surely, 2^666526464 is an apocalyptic number.

666526464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

666526464 is an abundant number, since it is smaller than the sum of its proper divisors (1255240292).

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

666526464 is a wasteful number, since it uses less digits than its factorization.

666526464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289313 (or 289296 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The square root of 666526464 is about 25817.1738189911. The cubic root of 666526464 is about 873.5192212875.

The spelling of 666526464 in words is "six hundred sixty-six million, five hundred twenty-six thousand, four hundred sixty-four".