66165969 has 4 divisors (see below), whose sum is σ = 88221296. Its totient is φ = 44110644.

The previous prime is 66165937. The next prime is 66165971. The reversal of 66165969 is 96956166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66165969 - 2⁵ = 66165937 is a prime.

It is a super-2 number, since 2×66165969² = 8755870907417922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66165919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11027659 + ... + 11027664.

It is an arithmetic number, because the mean of its divisors is an integer number (22055324).

Almost surely, 2^66165969 is an apocalyptic number.

It is an amenable number.

66165969 is a deficient number, since it is larger than the sum of its proper divisors (22055327).

66165969 is a wasteful number, since it uses less digits than its factorization.

66165969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22055326.

The product of its digits is 524880, while the sum is 48.

The square root of 66165969 is about 8134.2466768595. The cubic root of 66165969 is about 404.4624662707.

The spelling of 66165969 in words is "sixty-six million, one hundred sixty-five thousand, nine hundred sixty-nine".