16401798139 has 4 divisors (see below), whose sum is σ = 16402774024. Its totient is φ = 16400822256.

The previous prime is 16401798121. The next prime is 16401798173. The reversal of 16401798139 is 93189710461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93189710461 = 24179 ⋅3854159.

It is a cyclic number.

It is not a de Polignac number, because 16401798139 - 2⁵ = 16401798107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16401798092 and 16401798101.

It is not an unprimeable number, because it can be changed into a prime (16401798239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462282 + ... + 496495.

It is an arithmetic number, because the mean of its divisors is an integer number (4100693506).

Almost surely, 2^16401798139 is an apocalyptic number.

16401798139 is a deficient number, since it is larger than the sum of its proper divisors (975885).

16401798139 is an equidigital number, since it uses as much as digits as its factorization.

16401798139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975884.

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 16401798139 in words is "sixteen billion, four hundred one million, seven hundred ninety-eight thousand, one hundred thirty-nine".