91986817305 has 16 divisors (see below), whose sum is σ = 148832605440. Its totient is φ = 48508403328.

The previous prime is 91986817291. The next prime is 91986817313. The reversal of 91986817305 is 50371868919.

It is not a de Polignac number, because 91986817305 - 2⁹ = 91986816793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34450657 + ... + 34453326.

It is an arithmetic number, because the mean of its divisors is an integer number (9302037840).

Almost surely, 2^91986817305 is an apocalyptic number.

It is an amenable number.

91986817305 is a deficient number, since it is larger than the sum of its proper divisors (56845788135).

91986817305 is a wasteful number, since it uses less digits than its factorization.

91986817305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68904080.

The product of its (nonzero) digits is 3265920, while the sum is 57.

The spelling of 91986817305 in words is "ninety-one billion, nine hundred eighty-six million, eight hundred seventeen thousand, three hundred five".