61611165 has 64 divisors (see below), whose sum is σ = 136581120. Its totient is φ = 25600320.

The previous prime is 61611157. The next prime is 61611191. The reversal of 61611165 is 56111616.

It is not a de Polignac number, because 61611165 - 2³ = 61611157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7432 + ... + 13358.

It is an arithmetic number, because the mean of its divisors is an integer number (2134080).

Almost surely, 2^61611165 is an apocalyptic number.

It is an amenable number.

61611165 is an abundant number, since it is smaller than the sum of its proper divisors (74969955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61611165 is a wasteful number, since it uses less digits than its factorization.

61611165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5959 (or 5953 counting only the distinct ones).

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

The square root of 61611165 is about 7849.2779922742. The cubic root of 61611165 is about 394.9600237276.

It can be divided in two parts, 61611 and 165, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 61611165 in words is "sixty-one million, six hundred eleven thousand, one hundred sixty-five".