664242424064 has 36 divisors (see below), whose sum is σ = 1339017828540. Its totient is φ = 328832870400.

The previous prime is 664242424057. The next prime is 664242424147. The reversal of 664242424064 is 460424242466.

It can be written as a sum of positive squares in 2 ways, for example, as 468666206464 + 195576217600 = 684592^2 + 442240^2 .

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, 12819179 + ... + 12870890.

Almost surely, 2^664242424064 is an apocalyptic number.

664242424064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664242424064 is an abundant number, since it is smaller than the sum of its proper divisors (674775404476).

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

664242424064 is a wasteful number, since it uses less digits than its factorization.

664242424064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25690186 (or 25690172 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 664242424064 in words is "six hundred sixty-four billion, two hundred forty-two million, four hundred twenty-four thousand, sixty-four".