61166521 has 4 divisors (see below), whose sum is σ = 65871652. Its totient is φ = 56461392.

The previous prime is 61166519. The next prime is 61166531. The reversal of 61166521 is 12566116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5812921 + 55353600 = 2411^2 + 7440^2 .

It is not a de Polignac number, because 61166521 - 2¹ = 61166519 is a prime.

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 61166521.

It is not an unprimeable number, because it can be changed into a prime (61166531) 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, 2352546 + ... + 2352571.

It is an arithmetic number, because the mean of its divisors is an integer number (16467913).

Almost surely, 2^61166521 is an apocalyptic number.

It is an amenable number.

61166521 is a deficient number, since it is larger than the sum of its proper divisors (4705131).

61166521 is a wasteful number, since it uses less digits than its factorization.

61166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4705130.

The product of its digits is 2160, while the sum is 28.

The square root of 61166521 is about 7820.9028251219. The cubic root of 61166521 is about 394.0075947414.

The spelling of 61166521 in words is "sixty-one million, one hundred sixty-six thousand, five hundred twenty-one".