91566417233 has 4 divisors (see below), whose sum is σ = 92234785380. Its totient is φ = 90898049088.

The previous prime is 91566417119. The next prime is 91566417289. The reversal of 91566417233 is 33271466519.

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

It can be written as a sum of positive squares in 2 ways, for example, as 76636509889 + 14929907344 = 276833^2 + 122188^2 .

It is a cyclic number.

It is not a de Polignac number, because 91566417233 - 2²² = 91562222929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91566017233) 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, 334183868 + ... + 334184141.

It is an arithmetic number, because the mean of its divisors is an integer number (23058696345).

Almost surely, 2^91566417233 is an apocalyptic number.

It is an amenable number.

91566417233 is a deficient number, since it is larger than the sum of its proper divisors (668368147).

91566417233 is a wasteful number, since it uses less digits than its factorization.

91566417233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668368146.

The product of its digits is 816480, while the sum is 47.

The spelling of 91566417233 in words is "ninety-one billion, five hundred sixty-six million, four hundred seventeen thousand, two hundred thirty-three".