91659015908197 has 4 divisors (see below), whose sum is σ = 91800683630496. Its totient is φ = 91517348185900.

The previous prime is 91659015908191. The next prime is 91659015908233. The reversal of 91659015908197 is 79180951095619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91659015908197 - 2³¹ = 91656868424549 is a prime.

It is a super-2 number, since 2×91659015908197² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91659015908191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70833860179 + ... + 70833861472.

It is an arithmetic number, because the mean of its divisors is an integer number (22950170907624).

Almost surely, 2^{91659015908197} is an apocalyptic number.

It is an amenable number.

91659015908197 is a deficient number, since it is larger than the sum of its proper divisors (141667722299).

91659015908197 is a wasteful number, since it uses less digits than its factorization.

91659015908197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141667722298.

The product of its (nonzero) digits is 55112400, while the sum is 70.

The spelling of 91659015908197 in words is "ninety-one trillion, six hundred fifty-nine billion, fifteen million, nine hundred eight thousand, one hundred ninety-seven".