91648084618 has 4 divisors (see below), whose sum is σ = 137472126930. Its totient is φ = 45824042308.

The previous prime is 91648084601. The next prime is 91648084663. The reversal of 91648084618 is 81648084619.

It is a happy number.

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., 90350139889 + 1297944729 = 300583^2 + 36027^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22912021153 + ... + 22912021156.

Almost surely, 2^91648084618 is an apocalyptic number.

91648084618 is a deficient number, since it is larger than the sum of its proper divisors (45824042312).

91648084618 is a wasteful number, since it uses less digits than its factorization.

91648084618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45824042311.

The product of its (nonzero) digits is 2654208, while the sum is 55.

Subtracting from 91648084618 its reverse (81648084619), we obtain a palindrome (9999999999).

The spelling of 91648084618 in words is "ninety-one billion, six hundred forty-eight million, eighty-four thousand, six hundred eighteen".