991794530990 has 8 divisors (see below), whose sum is σ = 1785230155800. Its totient is φ = 396717812392.

The previous prime is 991794530989. The next prime is 991794531011. The reversal of 991794530990 is 99035497199.

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

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, 49589726540 + ... + 49589726559.

It is an arithmetic number, because the mean of its divisors is an integer number (223153769475).

Almost surely, 2^991794530990 is an apocalyptic number.

991794530990 is a deficient number, since it is larger than the sum of its proper divisors (793435624810).

991794530990 is a wasteful number, since it uses less digits than its factorization.

991794530990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99179453106.

The product of its (nonzero) digits is 24800580, while the sum is 65.

The spelling of 991794530990 in words is "nine hundred ninety-one billion, seven hundred ninety-four million, five hundred thirty thousand, nine hundred ninety".