664278214816 has 24 divisors (see below), whose sum is σ = 1308386708244. Its totient is φ = 331989527040.

The previous prime is 664278214793. The next prime is 664278214837. The reversal of 664278214816 is 618412872466.

It can be written as a sum of positive squares in 2 ways, for example, as 649539283600 + 14738931216 = 805940^2 + 121404^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4602205 + ... + 4744348.

Almost surely, 2^664278214816 is an apocalyptic number.

It is an amenable number.

664278214816 is a deficient number, since it is larger than the sum of its proper divisors (644108493428).

664278214816 is a wasteful number, since it uses less digits than its factorization.

664278214816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9348784 (or 9348776 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 55.

The spelling of 664278214816 in words is "six hundred sixty-four billion, two hundred seventy-eight million, two hundred fourteen thousand, eight hundred sixteen".