648307966 has 4 divisors (see below), whose sum is σ = 972461952. Its totient is φ = 324153982.

The previous prime is 648307927. The next prime is 648307997. The reversal of 648307966 is 669703846.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162076990 + ... + 162076993.

It is an arithmetic number, because the mean of its divisors is an integer number (243115488).

Almost surely, 2^648307966 is an apocalyptic number.

648307966 is a deficient number, since it is larger than the sum of its proper divisors (324153986).

648307966 is a wasteful number, since it uses less digits than its factorization.

648307966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324153985.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 648307966 is about 25461.8924277046. The cubic root of 648307966 is about 865.4868080751.

The spelling of 648307966 in words is "six hundred forty-eight million, three hundred seven thousand, nine hundred sixty-six".