15998489951 has 8 divisors (see below), whose sum is σ = 16585455744. Its totient is φ = 15415954560.

The previous prime is 15998489939. The next prime is 15998489957.

15998489951 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 15998489951 - 2²⁶ = 15931381087 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 (15998489957) 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, 1100246 + ... + 1114691.

It is an arithmetic number, because the mean of its divisors is an integer number (2073181968).

Almost surely, 2^15998489951 is an apocalyptic number.

15998489951 is a deficient number, since it is larger than the sum of its proper divisors (586965793).

15998489951 is a wasteful number, since it uses less digits than its factorization.

15998489951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215201.

The product of its digits is 41990400, while the sum is 68.

The spelling of 15998489951 in words is "fifteen billion, nine hundred ninety-eight million, four hundred eighty-nine thousand, nine hundred fifty-one".