99178104491 has 4 divisors (see below), whose sum is σ = 99427923792. Its totient is φ = 98928285192.

The previous prime is 99178104479. The next prime is 99178104497. The reversal of 99178104491 is 19440187199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19440187199 = 32831 ⋅592129.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99178104491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99178104497) 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, 124909055 + ... + 124909848.

It is an arithmetic number, because the mean of its divisors is an integer number (24856980948).

Almost surely, 2^99178104491 is an apocalyptic number.

99178104491 is a deficient number, since it is larger than the sum of its proper divisors (249819301).

99178104491 is a wasteful number, since it uses less digits than its factorization.

99178104491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249819300.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 99178104491 in words is "ninety-nine billion, one hundred seventy-eight million, one hundred four thousand, four hundred ninety-one".