66570161 has 4 divisors (see below), whose sum is σ = 76080192. Its totient is φ = 57060132.

The previous prime is 66570107. The next prime is 66570169. The reversal of 66570161 is 16107566.

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 66570161 - 2¹⁴ = 66553777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66570169) 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, 4755005 + ... + 4755018.

It is an arithmetic number, because the mean of its divisors is an integer number (19020048).

Almost surely, 2^66570161 is an apocalyptic number.

It is an amenable number.

66570161 is a deficient number, since it is larger than the sum of its proper divisors (9510031).

66570161 is an equidigital number, since it uses as much as digits as its factorization.

66570161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510030.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 66570161 is about 8159.0539279993. The cubic root of 66570161 is about 405.2843829000.

The spelling of 66570161 in words is "sixty-six million, five hundred seventy thousand, one hundred sixty-one".