66570362161 has 2 divisors, whose sum is σ = 66570362162. Its totient is φ = 66570362160.

The previous prime is 66570362153. The next prime is 66570362219. The reversal of 66570362161 is 16126307566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61463830561 + 5106531600 = 247919^2 + 71460^2 .

It is a cyclic number.

It is not a de Polignac number, because 66570362161 - 2³ = 66570362153 is a prime.

It is a super-2 number, since 2×66570362161² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66570362461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285181080 + 33285181081.

It is an arithmetic number, because the mean of its divisors is an integer number (33285181081).

Almost surely, 2^66570362161 is an apocalyptic number.

It is an amenable number.

66570362161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66570362161 is an equidigital number, since it uses as much as digits as its factorization.

66570362161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 66570362161 in words is "sixty-six billion, five hundred seventy million, three hundred sixty-two thousand, one hundred sixty-one".