991274617692 has 36 divisors (see below), whose sum is σ = 2506444584280. Its totient is φ = 330329580192.

The previous prime is 991274617691. The next prime is 991274617699. The reversal of 991274617692 is 296716472199.

991274617692 is a `hidden beast` number, since 9 + 9 + 1 + 2 + 7 + 4 + 617 + 6 + 9 + 2 = 666.

991274617692 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991274617691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3843898 + ... + 4093665.

Almost surely, 2^991274617692 is an apocalyptic number.

It is an amenable number.

991274617692 is an abundant number, since it is smaller than the sum of its proper divisors (1515169966588).

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

991274617692 is a wasteful number, since it uses less digits than its factorization.

991274617692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941042 (or 7941037 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 991274617692 in words is "nine hundred ninety-one billion, two hundred seventy-four million, six hundred seventeen thousand, six hundred ninety-two".