16431641806 has 4 divisors (see below), whose sum is σ = 24647462712. Its totient is φ = 8215820902.

The previous prime is 16431641801. The next prime is 16431641827. The reversal of 16431641806 is 60814613461.

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

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (16431641801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4107910450 + ... + 4107910453.

It is an arithmetic number, because the mean of its divisors is an integer number (6161865678).

Almost surely, 2^16431641806 is an apocalyptic number.

16431641806 is a deficient number, since it is larger than the sum of its proper divisors (8215820906).

16431641806 is an equidigital number, since it uses as much as digits as its factorization.

16431641806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8215820905.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 16431641806 in words is "sixteen billion, four hundred thirty-one million, six hundred forty-one thousand, eight hundred six".