66164665 has 24 divisors (see below), whose sum is σ = 92796480. Its totient is φ = 44351904.

The previous prime is 66164653. The next prime is 66164671. The reversal of 66164665 is 56646166.

It is a de Polignac number, because none of the positive numbers 2^k-66164665 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369546 + ... + 369724.

It is an arithmetic number, because the mean of its divisors is an integer number (3866520).

Almost surely, 2^66164665 is an apocalyptic number.

It is an amenable number.

66164665 is a deficient number, since it is larger than the sum of its proper divisors (26631815).

66164665 is an equidigital number, since it uses as much as digits as its factorization.

66164665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 250 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 66164665 is about 8134.1665215313. The cubic root of 66164665 is about 404.4598092023.

The spelling of 66164665 in words is "sixty-six million, one hundred sixty-four thousand, six hundred sixty-five".