61166665 has 8 divisors (see below), whose sum is σ = 83885760. Its totient is φ = 41942832.

The previous prime is 61166647. The next prime is 61166671. The reversal of 61166665 is 56666116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61166665 - 2¹¹ = 61164617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873775 + ... + 873844.

It is an arithmetic number, because the mean of its divisors is an integer number (10485720).

Almost surely, 2^61166665 is an apocalyptic number.

It is an amenable number.

61166665 is a deficient number, since it is larger than the sum of its proper divisors (22719095).

61166665 is a wasteful number, since it uses less digits than its factorization.

61166665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747631.

The product of its digits is 38880, while the sum is 37.

The square root of 61166665 is about 7820.9120312148. The cubic root of 61166665 is about 394.0079039359.

It can be divided in two parts, 611 and 66665, that added together give a palindrome (67276).

The spelling of 61166665 in words is "sixty-one million, one hundred sixty-six thousand, six hundred sixty-five".