66072166 has 24 divisors (see below), whose sum is σ = 107537544. Its totient is φ = 30340800.

The previous prime is 66072151. The next prime is 66072173. The reversal of 66072166 is 66127066.

It is a super-2 number, since 2×66072166² = 8731062239863112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62341 + ... + 63391.

It is an arithmetic number, because the mean of its divisors is an integer number (4480731).

Almost surely, 2^66072166 is an apocalyptic number.

66072166 is a deficient number, since it is larger than the sum of its proper divisors (41465378).

66072166 is a wasteful number, since it uses less digits than its factorization.

66072166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66072166 is about 8128.4787014545. The cubic root of 66072166 is about 404.2712414038.

The spelling of 66072166 in words is "sixty-six million, seventy-two thousand, one hundred sixty-six".