66775165 has 8 divisors (see below), whose sum is σ = 80241408. Its totient is φ = 53346000.

The previous prime is 66775153. The next prime is 66775193. The reversal of 66775165 is 56157766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66775165 - 2¹⁷ = 66644093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5137 + ... + 12646.

It is an arithmetic number, because the mean of its divisors is an integer number (10030176).

Almost surely, 2^66775165 is an apocalyptic number.

It is an amenable number.

66775165 is a deficient number, since it is larger than the sum of its proper divisors (13466243).

66775165 is a wasteful number, since it uses less digits than its factorization.

66775165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18539.

The product of its digits is 264600, while the sum is 43.

The square root of 66775165 is about 8171.6072470475. The cubic root of 66775165 is about 405.6999834075.

The spelling of 66775165 in words is "sixty-six million, seven hundred seventy-five thousand, one hundred sixty-five".