664797186 has 16 divisors (see below), whose sum is σ = 1477327200. Its totient is φ = 221599044.

The previous prime is 664797181. The next prime is 664797197. The reversal of 664797186 is 681797466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12311059 = 664797186 / (6 + 6 + 4 + 7 + 9 + 7 + 1 + 8 + 6).

It is not an unprimeable number, because it can be changed into a prime (664797181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6155476 + ... + 6155583.

It is an arithmetic number, because the mean of its divisors is an integer number (92332950).

Almost surely, 2^664797186 is an apocalyptic number.

664797186 is an abundant number, since it is smaller than the sum of its proper divisors (812530014).

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

664797186 is a wasteful number, since it uses less digits than its factorization.

664797186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12311070 (or 12311064 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 664797186 is about 25783.6612217893. The cubic root of 664797186 is about 872.7631293684.

The spelling of 664797186 in words is "six hundred sixty-four million, seven hundred ninety-seven thousand, one hundred eighty-six".