66560161 has 4 divisors (see below), whose sum is σ = 66875824. Its totient is φ = 66244500.

The previous prime is 66560147. The next prime is 66560167. The reversal of 66560161 is 16106566.

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 a cyclic number.

It is not a de Polignac number, because 66560161 - 2¹⁷ = 66429089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66560167) 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, 157515 + ... + 157936.

It is an arithmetic number, because the mean of its divisors is an integer number (16718956).

Almost surely, 2^66560161 is an apocalyptic number.

It is an amenable number.

66560161 is a deficient number, since it is larger than the sum of its proper divisors (315663).

66560161 is a wasteful number, since it uses less digits than its factorization.

66560161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315662.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66560161 is about 8158.4410888355. The cubic root of 66560161 is about 405.2640882880.

The spelling of 66560161 in words is "sixty-six million, five hundred sixty thousand, one hundred sixty-one".