66145161 has 4 divisors (see below), whose sum is σ = 88193552. Its totient is φ = 44096772.

The previous prime is 66145141. The next prime is 66145169. The reversal of 66145161 is 16154166.

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 not a de Polignac number, because 66145161 - 2⁵ = 66145129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66145169) 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, 11024191 + ... + 11024196.

It is an arithmetic number, because the mean of its divisors is an integer number (22048388).

Almost surely, 2^66145161 is an apocalyptic number.

It is an amenable number.

66145161 is a deficient number, since it is larger than the sum of its proper divisors (22048391).

66145161 is a wasteful number, since it uses less digits than its factorization.

66145161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22048390.

The product of its digits is 4320, while the sum is 30.

The square root of 66145161 is about 8132.9675395885. The cubic root of 66145161 is about 404.4200631164.

The spelling of 66145161 in words is "sixty-six million, one hundred forty-five thousand, one hundred sixty-one".