664887709140 has 24 divisors (see below), whose sum is σ = 1861685585760. Its totient is φ = 177303389088.

The previous prime is 664887709139. The next prime is 664887709147. The reversal of 664887709140 is 41907788466.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 11081461819 = 664887709140 / (6 + 6 + 4 + 8 + 8 + 7 + 7 + 0 + 9 + 1 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664887709147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5540730850 + ... + 5540730969.

It is an arithmetic number, because the mean of its divisors is an integer number (77570232740).

Almost surely, 2^664887709140 is an apocalyptic number.

664887709140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664887709140 is an abundant number, since it is smaller than the sum of its proper divisors (1196797876620).

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

664887709140 is a wasteful number, since it uses less digits than its factorization.

664887709140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11081461831 (or 11081461829 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 664887709140 in words is "six hundred sixty-four billion, eight hundred eighty-seven million, seven hundred nine thousand, one hundred forty".