16405706398 has 4 divisors (see below), whose sum is σ = 24608559600. Its totient is φ = 8202853198.

The previous prime is 16405706341. The next prime is 16405706407. The reversal of 16405706398 is 89360750461.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4101426598 + ... + 4101426601.

It is an arithmetic number, because the mean of its divisors is an integer number (6152139900).

Almost surely, 2^16405706398 is an apocalyptic number.

16405706398 is a deficient number, since it is larger than the sum of its proper divisors (8202853202).

16405706398 is an equidigital number, since it uses as much as digits as its factorization.

16405706398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202853201.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 16405706398 in words is "sixteen billion, four hundred five million, seven hundred six thousand, three hundred ninety-eight".