66771165 has 16 divisors (see below), whose sum is σ = 109440576. Its totient is φ = 34742400.

The previous prime is 66771091. The next prime is 66771167. The reversal of 66771165 is 56117766.

It is not a de Polignac number, because 66771165 - 2¹⁰ = 66770141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66771167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53671 + ... + 54900.

It is an arithmetic number, because the mean of its divisors is an integer number (6840036).

Almost surely, 2^66771165 is an apocalyptic number.

It is an amenable number.

66771165 is a deficient number, since it is larger than the sum of its proper divisors (42669411).

66771165 is a wasteful number, since it uses less digits than its factorization.

66771165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108620.

The product of its digits is 52920, while the sum is 39.

The square root of 66771165 is about 8171.3624934891. The cubic root of 66771165 is about 405.6918824300.

The spelling of 66771165 in words is "sixty-six million, seven hundred seventy-one thousand, one hundred sixty-five".