991983690246 has 8 divisors (see below), whose sum is σ = 1983967380504. Its totient is φ = 330661230080.

The previous prime is 991983690221. The next prime is 991983690287. The reversal of 991983690246 is 642096389199.

It is a happy number.

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

991983690246 is an admirable number.

It is a congruent number.

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, 82665307515 + ... + 82665307526.

It is an arithmetic number, because the mean of its divisors is an integer number (247995922563).

Almost surely, 2^991983690246 is an apocalyptic number.

991983690246 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

991983690246 is a wasteful number, since it uses less digits than its factorization.

991983690246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165330615046.

The product of its (nonzero) digits is 45349632, while the sum is 66.

The spelling of 991983690246 in words is "nine hundred ninety-one billion, nine hundred eighty-three million, six hundred ninety thousand, two hundred forty-six".