15999899951 has 8 divisors (see below), whose sum is σ = 18466646304. Its totient is φ = 13578415200.

The previous prime is 15999899947. The next prime is 15999899953.

15999899951 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15999899951 - 2² = 15999899947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15999899953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11314640 + ... + 11316053.

It is an arithmetic number, because the mean of its divisors is an integer number (2308330788).

Almost surely, 2^15999899951 is an apocalyptic number.

15999899951 is a deficient number, since it is larger than the sum of its proper divisors (2466746353).

15999899951 is a wasteful number, since it uses less digits than its factorization.

15999899951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22630801.

The product of its digits is 106288200, while the sum is 74.

The spelling of 15999899951 in words is "fifteen billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, nine hundred fifty-one".