16656891149 has 4 divisors (see below), whose sum is σ = 16658621760. Its totient is φ = 16655160540.

The previous prime is 16656891127. The next prime is 16656891187. The reversal of 16656891149 is 94119865661.

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.

It is a cyclic number.

It is not a de Polignac number, because 16656891149 - 2⁸ = 16656890893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16656891094 and 16656891103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656891109) 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, 850787 + ... + 870144.

It is an arithmetic number, because the mean of its divisors is an integer number (4164655440).

Almost surely, 2^16656891149 is an apocalyptic number.

It is an amenable number.

16656891149 is a deficient number, since it is larger than the sum of its proper divisors (1730611).

16656891149 is an equidigital number, since it uses as much as digits as its factorization.

16656891149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730610.

The product of its digits is 2799360, while the sum is 56.

The spelling of 16656891149 in words is "sixteen billion, six hundred fifty-six million, eight hundred ninety-one thousand, one hundred forty-nine".