91308739658 has 16 divisors (see below), whose sum is σ = 138306714624. Its totient is φ = 45207882720.

The previous prime is 91308739637. The next prime is 91308739667. The reversal of 91308739658 is 85693780319.

It is a junction number, because it is equal to n+sod(n) for n = 91308739597 and 91308739606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212660 + ... + 477327.

It is an arithmetic number, because the mean of its divisors is an integer number (8644169664).

Almost surely, 2^91308739658 is an apocalyptic number.

91308739658 is a deficient number, since it is larger than the sum of its proper divisors (46997974966).

91308739658 is a wasteful number, since it uses less digits than its factorization.

91308739658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690637.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 91308739658 in words is "ninety-one billion, three hundred eight million, seven hundred thirty-nine thousand, six hundred fifty-eight".