990894804851 has 8 divisors (see below), whose sum is σ = 1132531299840. Its totient is φ = 849278333448.

The previous prime is 990894804841. The next prime is 990894804857. The reversal of 990894804851 is 158408498099.

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

It is a cyclic number.

It is not a de Polignac number, because 990894804851 - 2³⁸ = 716016897907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990894804857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4899701 + ... + 5097926.

It is an arithmetic number, because the mean of its divisors is an integer number (141566412480).

Almost surely, 2^990894804851 is an apocalyptic number.

990894804851 is a deficient number, since it is larger than the sum of its proper divisors (141636494989).

990894804851 is a wasteful number, since it uses less digits than its factorization.

990894804851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10011793.

The product of its (nonzero) digits is 29859840, while the sum is 65.

The spelling of 990894804851 in words is "nine hundred ninety billion, eight hundred ninety-four million, eight hundred four thousand, eight hundred fifty-one".