660488290640 has 40 divisors (see below), whose sum is σ = 1545805074048. Its totient is φ = 262445673600.

The previous prime is 660488290639. The next prime is 660488290687. The reversal of 660488290640 is 46092884066.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×660488290640² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27326012 + ... + 27350171.

Almost surely, 2^660488290640 is an apocalyptic number.

It is an amenable number.

660488290640 is an abundant number, since it is smaller than the sum of its proper divisors (885316783408).

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

660488290640 is a wasteful number, since it uses less digits than its factorization.

660488290640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54676347 (or 54676341 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 660488290640 in words is "six hundred sixty billion, four hundred eighty-eight million, two hundred ninety thousand, six hundred forty".