61166218 has 4 divisors (see below), whose sum is σ = 91749330. Its totient is φ = 30583108.

The previous prime is 61166213. The next prime is 61166297. The reversal of 61166218 is 81266116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31102929 + 30063289 = 5577^2 + 5483^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 61166218.

It is not an unprimeable number, because it can be changed into a prime (61166213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15291553 + ... + 15291556.

Almost surely, 2^61166218 is an apocalyptic number.

61166218 is a deficient number, since it is larger than the sum of its proper divisors (30583112).

61166218 is a wasteful number, since it uses less digits than its factorization.

61166218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30583111.

The product of its digits is 3456, while the sum is 31.

The square root of 61166218 is about 7820.8834539328. The cubic root of 61166218 is about 394.0069441431.

The spelling of 61166218 in words is "sixty-one million, one hundred sixty-six thousand, two hundred eighteen".