61165161 has 24 divisors (see below), whose sum is σ = 94068000. Its totient is φ = 38187072.

The previous prime is 61165141. The next prime is 61165177. The reversal of 61165161 is 16156116.

61165161 is a `hidden beast` number, since 6 + 1 + 1 + 651 + 6 + 1 = 666.

It is not a de Polignac number, because 61165161 - 2⁵ = 61165129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61165141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13210 + ... + 17228.

It is an arithmetic number, because the mean of its divisors is an integer number (3919500).

Almost surely, 2^61165161 is an apocalyptic number.

It is an amenable number.

61165161 is a deficient number, since it is larger than the sum of its proper divisors (32902839).

61165161 is a wasteful number, since it uses less digits than its factorization.

61165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133 (or 4130 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 61165161 is about 7820.8158781549. The cubic root of 61165161 is about 394.0046745475.

The spelling of 61165161 in words is "sixty-one million, one hundred sixty-five thousand, one hundred sixty-one".