91859659617 has 8 divisors (see below), whose sum is σ = 133614050400. Its totient is φ = 55672520960.

The previous prime is 91859659609. The next prime is 91859659649. The reversal of 91859659617 is 71695695819.

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 91859659617 - 2³ = 91859659609 is a prime.

It is a super-2 number, since 2×91859659617² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91859659657) 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 7 ways as a sum of consecutive naturals, for example, 1391812992 + ... + 1391813057.

It is an arithmetic number, because the mean of its divisors is an integer number (16701756300).

Almost surely, 2^91859659617 is an apocalyptic number.

It is an amenable number.

91859659617 is a deficient number, since it is larger than the sum of its proper divisors (41754390783).

91859659617 is a wasteful number, since it uses less digits than its factorization.

91859659617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783626063.

The product of its digits is 36741600, while the sum is 66.

The spelling of 91859659617 in words is "ninety-one billion, eight hundred fifty-nine million, six hundred fifty-nine thousand, six hundred seventeen".