10891817990 has 16 divisors (see below), whose sum is σ = 19713592080. Its totient is φ = 4332656160.

The previous prime is 10891817971. The next prime is 10891818011. The reversal of 10891817990 is 9971819801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3006980 + ... + 3010599.

It is an arithmetic number, because the mean of its divisors is an integer number (1232099505).

Almost surely, 2^10891817990 is an apocalyptic number.

10891817990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10891817990 is a deficient number, since it is larger than the sum of its proper divisors (8821774090).

10891817990 is a wasteful number, since it uses less digits than its factorization.

10891817990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6017767.

The product of its (nonzero) digits is 326592, while the sum is 53.

The spelling of 10891817990 in words is "ten billion, eight hundred ninety-one million, eight hundred seventeen thousand, nine hundred ninety".