16537880189 has 4 divisors (see below), whose sum is σ = 16544724924. Its totient is φ = 16531035456.

The previous prime is 16537880179. The next prime is 16537880197. The reversal of 16537880189 is 98108873561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12021368164 + 4516512025 = 109642^2 + 67205^2 .

It is a cyclic number.

It is not a de Polignac number, because 16537880189 - 2⁸ = 16537879933 is a prime.

It is a super-2 number, since 2×16537880189² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16537880179) 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, 3418742 + ... + 3423575.

It is an arithmetic number, because the mean of its divisors is an integer number (4136181231).

Almost surely, 2^16537880189 is an apocalyptic number.

It is an amenable number.

16537880189 is a deficient number, since it is larger than the sum of its proper divisors (6844735).

16537880189 is an equidigital number, since it uses as much as digits as its factorization.

16537880189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844734.

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 16537880189 in words is "sixteen billion, five hundred thirty-seven million, eight hundred eighty thousand, one hundred eighty-nine".