6664913640 has 192 divisors, whose sum is σ = 27005996160. Its totient is φ = 1384911360.

The previous prime is 6664913623. The next prime is 6664913657. The reversal of 6664913640 is 463194666.

It is an interprime number because it is at equal distance from previous prime (6664913623) and next prime (6664913657).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92499 + ... + 147938.

It is an arithmetic number, because the mean of its divisors is an integer number (140656230).

Almost surely, 2^6664913640 is an apocalyptic number.

6664913640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6664913640 is an abundant number, since it is smaller than the sum of its proper divisors (20341082520).

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

6664913640 is a wasteful number, since it uses less digits than its factorization.

6664913640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240472 (or 240465 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 6664913640 is about 81638.9223348765. The cubic root of 6664913640 is about 1881.9070771752.

The spelling of 6664913640 in words is "six billion, six hundred sixty-four million, nine hundred thirteen thousand, six hundred forty".