16900018891 has 4 divisors (see below), whose sum is σ = 19314307312. Its totient is φ = 14485730472.

The previous prime is 16900018871. The next prime is 16900018907. The reversal of 16900018891 is 19881000961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19881000961 = 653 ⋅30445637.

It is a cyclic number.

It is not a de Polignac number, because 16900018891 - 2²⁹ = 16363147979 is a prime.

It is a super-2 number, since 2×16900018891² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16900018871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207144200 + ... + 1207144213.

It is an arithmetic number, because the mean of its divisors is an integer number (4828576828).

Almost surely, 2^16900018891 is an apocalyptic number.

16900018891 is a deficient number, since it is larger than the sum of its proper divisors (2414288421).

16900018891 is an equidigital number, since it uses as much as digits as its factorization.

16900018891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414288420.

The product of its (nonzero) digits is 31104, while the sum is 43.

The spelling of 16900018891 in words is "sixteen billion, nine hundred million, eighteen thousand, eight hundred ninety-one".