66744855165 has 16 divisors (see below), whose sum is σ = 106794979200. Its totient is φ = 35596185792.

The previous prime is 66744855137. The next prime is 66744855181. The reversal of 66744855165 is 56155844766.

It is a happy number.

It is not a de Polignac number, because 66744855165 - 2²³ = 66736466557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892231 + ... + 964139.

It is an arithmetic number, because the mean of its divisors is an integer number (6674686200).

Almost surely, 2^66744855165 is an apocalyptic number.

It is an amenable number.

66744855165 is a deficient number, since it is larger than the sum of its proper divisors (40050124035).

66744855165 is a wasteful number, since it uses less digits than its factorization.

66744855165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133796.

The product of its digits is 24192000, while the sum is 57.

The spelling of 66744855165 in words is "sixty-six billion, seven hundred forty-four million, eight hundred fifty-five thousand, one hundred sixty-five".