648432666 has 48 divisors (see below), whose sum is σ = 1700097984. Its totient is φ = 174367872.

The previous prime is 648432643. The next prime is 648432677. The reversal of 648432666 is 666234846.

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 23 ways as a sum of consecutive naturals, for example, 149220 + ... + 153503.

It is an arithmetic number, because the mean of its divisors is an integer number (35418708).

Almost surely, 2^648432666 is an apocalyptic number.

648432666 is an abundant number, since it is smaller than the sum of its proper divisors (1051665318).

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

648432666 is a wasteful number, since it uses less digits than its factorization.

648432666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302755 (or 302752 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 648432666 is about 25464.3410674614. The cubic root of 648432666 is about 865.5422957403.

The spelling of 648432666 in words is "six hundred forty-eight million, four hundred thirty-two thousand, six hundred sixty-six".