91718598661 has 8 divisors (see below), whose sum is σ = 91851992064. Its totient is φ = 91585300800.

The previous prime is 91718598649. The next prime is 91718598677. The reversal of 91718598661 is 16689581719.

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 91718598661 - 2¹⁵ = 91718565893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91718598661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91718598691) 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, 2022906 + ... + 2067748.

It is an arithmetic number, because the mean of its divisors is an integer number (11481499008).

Almost surely, 2^91718598661 is an apocalyptic number.

It is an amenable number.

91718598661 is a deficient number, since it is larger than the sum of its proper divisors (133393403).

91718598661 is a wasteful number, since it uses less digits than its factorization.

91718598661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47771.

The product of its digits is 6531840, while the sum is 61.

The spelling of 91718598661 in words is "ninety-one billion, seven hundred eighteen million, five hundred ninety-eight thousand, six hundred sixty-one".