664666450572 has 24 divisors (see below), whose sum is σ = 1554047030592. Its totient is φ = 221104248400.

The previous prime is 664666450561. The next prime is 664666450577. The reversal of 664666450572 is 275054666466.

It is not an unprimeable number, because it can be changed into a prime (664666450577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56398254 + ... + 56410037.

It is an arithmetic number, because the mean of its divisors is an integer number (64751959608).

Almost surely, 2^664666450572 is an apocalyptic number.

It is an amenable number.

664666450572 is an abundant number, since it is smaller than the sum of its proper divisors (889380580020).

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

664666450572 is a wasteful number, since it uses less digits than its factorization.

664666450572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112808789 (or 112808787 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 57.

The spelling of 664666450572 in words is "six hundred sixty-four billion, six hundred sixty-six million, four hundred fifty thousand, five hundred seventy-two".