61166559 has 4 divisors (see below), whose sum is σ = 81555416. Its totient is φ = 40777704.

The previous prime is 61166557. The next prime is 61166563. The reversal of 61166559 is 95566116.

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

It is not a de Polignac number, because 61166559 - 2¹ = 61166557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61166557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10194424 + ... + 10194429.

It is an arithmetic number, because the mean of its divisors is an integer number (20388854).

Almost surely, 2^61166559 is an apocalyptic number.

61166559 is a deficient number, since it is larger than the sum of its proper divisors (20388857).

61166559 is a wasteful number, since it uses less digits than its factorization.

61166559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20388856.

The product of its digits is 48600, while the sum is 39.

The square root of 61166559 is about 7820.9052545086. The cubic root of 61166559 is about 394.0076763344.

The spelling of 61166559 in words is "sixty-one million, one hundred sixty-six thousand, five hundred fifty-nine".