61166881 has 4 divisors (see below), whose sum is σ = 62468352. Its totient is φ = 59865412.

The previous prime is 61166873. The next prime is 61166899. The reversal of 61166881 is 18866116.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 61166881 - 2³ = 61166873 is a prime.

It is a super-2 number, since 2×61166881² = 7482774662536322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61166881.

It is not an unprimeable number, because it can be changed into a prime (61166381) 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, 650665 + ... + 650758.

It is an arithmetic number, because the mean of its divisors is an integer number (15617088).

Almost surely, 2^61166881 is an apocalyptic number.

It is an amenable number.

61166881 is a deficient number, since it is larger than the sum of its proper divisors (1301471).

61166881 is a wasteful number, since it uses less digits than its factorization.

61166881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301470.

The product of its digits is 13824, while the sum is 37.

The square root of 61166881 is about 7820.9258403337. The cubic root of 61166881 is about 394.0083677266.

The spelling of 61166881 in words is "sixty-one million, one hundred sixty-six thousand, eight hundred eighty-one".