91642663 has 4 divisors (see below), whose sum is σ = 104734480. Its totient is φ = 78550848.

The previous prime is 91642657. The next prime is 91642687. The reversal of 91642663 is 36624619.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 91642663 - 2¹⁷ = 91511591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91642633) 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, 6545898 + ... + 6545911.

It is an arithmetic number, because the mean of its divisors is an integer number (26183620).

Almost surely, 2^91642663 is an apocalyptic number.

91642663 is a deficient number, since it is larger than the sum of its proper divisors (13091817).

91642663 is a wasteful number, since it uses less digits than its factorization.

91642663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13091816.

The product of its digits is 46656, while the sum is 37.

The square root of 91642663 is about 9573.0174448812. The cubic root of 91642663 is about 450.8505116628.

The spelling of 91642663 in words is "ninety-one million, six hundred forty-two thousand, six hundred sixty-three".