16198961599 has 4 divisors (see below), whose sum is σ = 16199319136. Its totient is φ = 16198604064.

The previous prime is 16198961593. The next prime is 16198961621. The reversal of 16198961599 is 99516989161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99516989161 = 157 ⋅633866173.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16198961599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16198961599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16198961593) 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, 98919 + ... + 205384.

It is an arithmetic number, because the mean of its divisors is an integer number (4049829784).

Almost surely, 2^16198961599 is an apocalyptic number.

16198961599 is a deficient number, since it is larger than the sum of its proper divisors (357537).

16198961599 is an equidigital number, since it uses as much as digits as its factorization.

16198961599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357536.

The product of its digits is 9447840, while the sum is 64.

The spelling of 16198961599 in words is "sixteen billion, one hundred ninety-eight million, nine hundred sixty-one thousand, five hundred ninety-nine".