91749777698 has 8 divisors (see below), whose sum is σ = 137627372700. Its totient is φ = 45873986800.

The previous prime is 91749777671. The next prime is 91749777701. The reversal of 91749777698 is 89677794719.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89734396249 + 2015381449 = 299557^2 + 44893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315773 + ... + 532176.

Almost surely, 2^91749777698 is an apocalyptic number.

91749777698 is a deficient number, since it is larger than the sum of its proper divisors (45877595002).

91749777698 is a wasteful number, since it uses less digits than its factorization.

91749777698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902052.

The product of its digits is 336063168, while the sum is 74.

The spelling of 91749777698 in words is "ninety-one billion, seven hundred forty-nine million, seven hundred seventy-seven thousand, six hundred ninety-eight".