664466643 has 12 divisors (see below), whose sum is σ = 963770808. Its totient is φ = 441138240.

The previous prime is 664466639. The next prime is 664466681. The reversal of 664466643 is 346664466.

It is not a de Polignac number, because 664466643 - 2² = 664466639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664466603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151005 + ... + 155342.

It is an arithmetic number, because the mean of its divisors is an integer number (80314234).

Almost surely, 2^664466643 is an apocalyptic number.

664466643 is a deficient number, since it is larger than the sum of its proper divisors (299304165).

664466643 is a wasteful number, since it uses less digits than its factorization.

664466643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306594 (or 306591 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 45.

The square root of 664466643 is about 25777.2504934099. The cubic root of 664466643 is about 872.6184568904.

The spelling of 664466643 in words is "six hundred sixty-four million, four hundred sixty-six thousand, six hundred forty-three".