16885989121 has 4 divisors (see below), whose sum is σ = 16887609792. Its totient is φ = 16884368452.

The previous prime is 16885989089. The next prime is 16885989161. The reversal of 16885989121 is 12198958861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12198958861 = 757 ⋅16114873.

It is a cyclic number.

It is not a de Polignac number, because 16885989121 - 2⁵ = 16885989089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16885989161) 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, 794605 + ... + 815578.

It is an arithmetic number, because the mean of its divisors is an integer number (4221902448).

Almost surely, 2^16885989121 is an apocalyptic number.

It is an amenable number.

16885989121 is a deficient number, since it is larger than the sum of its proper divisors (1620671).

16885989121 is a wasteful number, since it uses less digits than its factorization.

16885989121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620670.

The product of its digits is 2488320, while the sum is 58.

The spelling of 16885989121 in words is "sixteen billion, eight hundred eighty-five million, nine hundred eighty-nine thousand, one hundred twenty-one".