16695259661 has 4 divisors (see below), whose sum is σ = 17270958300. Its totient is φ = 16119561024.

The previous prime is 16695259639. The next prime is 16695259699.

It is a happy number.

16695259661 is nontrivially palindromic in base 10.

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 5519598436 + 11175661225 = 74294^2 + 105715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16695259661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16695259597 and 16695259606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16695259601) 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, 287849276 + ... + 287849333.

It is an arithmetic number, because the mean of its divisors is an integer number (4317739575).

Almost surely, 2^16695259661 is an apocalyptic number.

It is an amenable number.

16695259661 is a deficient number, since it is larger than the sum of its proper divisors (575698639).

16695259661 is an equidigital number, since it uses as much as digits as its factorization.

16695259661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575698638.

The product of its digits is 5248800, while the sum is 56.

The spelling of 16695259661 in words is "sixteen billion, six hundred ninety-five million, two hundred fifty-nine thousand, six hundred sixty-one".