991774059695 has 16 divisors (see below), whose sum is σ = 1199792619360. Its totient is φ = 786999083904.

The previous prime is 991774059691. The next prime is 991774059751. The reversal of 991774059695 is 596950477199.

It is a cyclic number.

It is not a de Polignac number, because 991774059695 - 2² = 991774059691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991774059691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040312 + ... + 1750941.

It is an arithmetic number, because the mean of its divisors is an integer number (74987038710).

Almost surely, 2^991774059695 is an apocalyptic number.

991774059695 is a deficient number, since it is larger than the sum of its proper divisors (208018559665).

991774059695 is a wasteful number, since it uses less digits than its factorization.

991774059695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791834.

The product of its (nonzero) digits is 192893400, while the sum is 71.

The spelling of 991774059695 in words is "nine hundred ninety-one billion, seven hundred seventy-four million, fifty-nine thousand, six hundred ninety-five".