691998899196 has 48 divisors (see below), whose sum is σ = 1769799927168. Its totient is φ = 208702804800.

The previous prime is 691998899177. The next prime is 691998899227.

691998899196 is nontrivially palindromic in base 10.

It is a congruent number.

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, 12394935 + ... + 12450638.

It is an arithmetic number, because the mean of its divisors is an integer number (36870831816).

Almost surely, 2^691998899196 is an apocalyptic number.

691998899196 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

691998899196 is an abundant number, since it is smaller than the sum of its proper divisors (1077801027972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691998899196 is a wasteful number, since it uses less digits than its factorization.

691998899196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24845802 (or 24845800 counting only the distinct ones).

The product of its digits is 1224440064, while the sum is 84.

The spelling of 691998899196 in words is "six hundred ninety-one billion, nine hundred ninety-eight million, eight hundred ninety-nine thousand, one hundred ninety-six".