16603668891 has 6 divisors (see below), whose sum is σ = 23983077300. Its totient is φ = 11069112588.

The previous prime is 16603668883. The next prime is 16603668901. The reversal of 16603668891 is 19886630661.

It is not a de Polignac number, because 16603668891 - 2³ = 16603668883 is a prime.

It is a super-2 number, since 2×16603668891² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16603668811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 922426041 + ... + 922426058.

It is an arithmetic number, because the mean of its divisors is an integer number (3997179550).

Almost surely, 2^16603668891 is an apocalyptic number.

16603668891 is a deficient number, since it is larger than the sum of its proper divisors (7379408409).

16603668891 is a wasteful number, since it uses less digits than its factorization.

16603668891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844852105 (or 1844852102 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 16603668891 in words is "sixteen billion, six hundred three million, six hundred sixty-eight thousand, eight hundred ninety-one".