61665616539717 has 16 divisors (see below), whose sum is σ = 82822555126272. Its totient is φ = 40809555947520.

The previous prime is 61665616539701. The next prime is 61665616539719. The reversal of 61665616539717 is 71793561656616.

It is not a de Polignac number, because 61665616539717 - 2⁴ = 61665616539701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665616539719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20532492 + ... + 23343402.

It is an arithmetic number, because the mean of its divisors is an integer number (5176409695392).

Almost surely, 2^{61665616539717} is an apocalyptic number.

It is an amenable number.

61665616539717 is a deficient number, since it is larger than the sum of its proper divisors (21156938586555).

61665616539717 is a wasteful number, since it uses less digits than its factorization.

61665616539717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864428.

The product of its digits is 257191200, while the sum is 69.

The spelling of 61665616539717 in words is "sixty-one trillion, six hundred sixty-five billion, six hundred sixteen million, five hundred thirty-nine thousand, seven hundred seventeen".