91601666792498 has 4 divisors (see below), whose sum is σ = 137402500188750. Its totient is φ = 45800833396248.

The previous prime is 91601666792497. The next prime is 91601666792513. The reversal of 91601666792498 is 89429766610619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 91346513506369 + 255153286129 = 9557537^2 + 505127^2 .

It is not an unprimeable number, because it can be changed into a prime (91601666792497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22900416698123 + ... + 22900416698126.

Almost surely, 2^{91601666792498} is an apocalyptic number.

91601666792498 is a deficient number, since it is larger than the sum of its proper divisors (45800833396252).

91601666792498 is a wasteful number, since it uses less digits than its factorization.

91601666792498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45800833396251.

The product of its (nonzero) digits is 423263232, while the sum is 74.

The spelling of 91601666792498 in words is "ninety-one trillion, six hundred one billion, six hundred sixty-six million, seven hundred ninety-two thousand, four hundred ninety-eight".