66173065 has 32 divisors (see below), whose sum is σ = 95109120. Its totient is φ = 43243200.

The previous prime is 66173053. The next prime is 66173101. The reversal of 66173065 is 56037166.

It is a happy number.

It is not a de Polignac number, because 66173065 - 2⁵ = 66173033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66173065.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76606 + ... + 77464.

It is an arithmetic number, because the mean of its divisors is an integer number (2972160).

Almost surely, 2^66173065 is an apocalyptic number.

It is an amenable number.

66173065 is a deficient number, since it is larger than the sum of its proper divisors (28936055).

66173065 is a wasteful number, since it uses less digits than its factorization.

66173065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66173065 is about 8134.6828456923. The cubic root of 66173065 is about 404.4769246754.

The spelling of 66173065 in words is "sixty-six million, one hundred seventy-three thousand, sixty-five".