61165881 has 32 divisors (see below), whose sum is σ = 109658880. Its totient is φ = 32894208.

The previous prime is 61165879. The next prime is 61165889. The reversal of 61165881 is 18856116.

61165881 is a `hidden beast` number, since 61 + 16 + 588 + 1 = 666.

61165881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61165881 - 2¹ = 61165879 is a prime.

It is a super-2 number, since 2×61165881² = 7482529997012322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61165889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6306 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (3426840).

Almost surely, 2^61165881 is an apocalyptic number.

It is an amenable number.

61165881 is a deficient number, since it is larger than the sum of its proper divisors (48492999).

61165881 is a wasteful number, since it uses less digits than its factorization.

61165881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19070 (or 19064 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 61165881 is about 7820.8619090226. The cubic root of 61165881 is about 394.0062205379.

The spelling of 61165881 in words is "sixty-one million, one hundred sixty-five thousand, eight hundred eighty-one".