664464525005640 has 128 divisors (see below), whose sum is σ = 2100864828873600. Its totient is φ = 167660257904640.

The previous prime is 664464525005623. The next prime is 664464525005689. The reversal of 664464525005640 is 46500525464466.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175613997 + ... + 179357756.

It is an arithmetic number, because the mean of its divisors is an integer number (16413006475575).

Almost surely, 2^{664464525005640} is an apocalyptic number.

664464525005640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664464525005640 is an abundant number, since it is smaller than the sum of its proper divisors (1436400303867960).

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

664464525005640 is a wasteful number, since it uses less digits than its factorization.

664464525005640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354972607 (or 354972603 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 57.

The spelling of 664464525005640 in words is "six hundred sixty-four trillion, four hundred sixty-four billion, five hundred twenty-five million, five thousand, six hundred forty".