16693396985 has 4 divisors (see below), whose sum is σ = 20032076388. Its totient is φ = 13354717584.

The previous prime is 16693396931. The next prime is 16693397003. The reversal of 16693396985 is 58969339661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58969339661 = 131 ⋅450147631.

It can be written as a sum of positive squares in 2 ways, for example, as 7493326096 + 9200070889 = 86564^2 + 95917^2 .

It is a cyclic number.

It is not a de Polignac number, because 16693396985 - 2⁶ = 16693396921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669339694 + ... + 1669339703.

It is an arithmetic number, because the mean of its divisors is an integer number (5008019097).

Almost surely, 2^16693396985 is an apocalyptic number.

It is an amenable number.

16693396985 is a deficient number, since it is larger than the sum of its proper divisors (3338679403).

16693396985 is an equidigital number, since it uses as much as digits as its factorization.

16693396985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338679402.

The product of its digits is 56687040, while the sum is 65.

The spelling of 16693396985 in words is "sixteen billion, six hundred ninety-three million, three hundred ninety-six thousand, nine hundred eighty-five".