61986665117 has 8 divisors (see below), whose sum is σ = 66769294200. Its totient is φ = 57206096640.

The previous prime is 61986665113. The next prime is 61986665141. The reversal of 61986665117 is 71156668916.

It can be written as a sum of positive squares in 4 ways, for example, as 3773522041 + 58213143076 = 61429^2 + 241274^2 .

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 61986665117 - 2² = 61986665113 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 (61986665113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452384 + ... + 573257.

It is an arithmetic number, because the mean of its divisors is an integer number (8346161775).

Almost surely, 2^61986665117 is an apocalyptic number.

It is an amenable number.

61986665117 is a deficient number, since it is larger than the sum of its proper divisors (4782629083).

61986665117 is a wasteful number, since it uses less digits than its factorization.

61986665117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030303.

The product of its digits is 3265920, while the sum is 56.

The spelling of 61986665117 in words is "sixty-one billion, nine hundred eighty-six million, six hundred sixty-five thousand, one hundred seventeen".