61117166661 has 16 divisors (see below), whose sum is σ = 81768993600. Its totient is φ = 40605130368.

The previous prime is 61117166629. The next prime is 61117166681. The reversal of 61117166661 is 16666171116.

It is not a de Polignac number, because 61117166661 - 2⁵ = 61117166629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61117166681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4919025 + ... + 4931433.

It is an arithmetic number, because the mean of its divisors is an integer number (5110562100).

Almost surely, 2^61117166661 is an apocalyptic number.

It is an amenable number.

61117166661 is a deficient number, since it is larger than the sum of its proper divisors (20651826939).

61117166661 is a wasteful number, since it uses less digits than its factorization.

61117166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17908.

The product of its digits is 54432, while the sum is 42.

The spelling of 61117166661 in words is "sixty-one billion, one hundred seventeen million, one hundred sixty-six thousand, six hundred sixty-one".