16399135999 has 16 divisors (see below), whose sum is σ = 18019054080. Its totient is φ = 14855369760.

The previous prime is 16399135981. The next prime is 16399136011. The reversal of 16399135999 is 99953199361.

It is a cyclic number.

It is not a de Polignac number, because 16399135999 - 2¹⁷ = 16399004927 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 16399135999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399135919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1857654 + ... + 1866460.

It is an arithmetic number, because the mean of its divisors is an integer number (1126190880).

Almost surely, 2^16399135999 is an apocalyptic number.

16399135999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16399135999 is a deficient number, since it is larger than the sum of its proper divisors (1619918081).

16399135999 is a wasteful number, since it uses less digits than its factorization.

16399135999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110.

The product of its digits is 15943230, while the sum is 64.

The spelling of 16399135999 in words is "sixteen billion, three hundred ninety-nine million, one hundred thirty-five thousand, nine hundred ninety-nine".