16431640443 has 12 divisors (see below), whose sum is σ = 23742482400. Its totient is φ = 10950785136.

The previous prime is 16431640417. The next prime is 16431640451. The reversal of 16431640443 is 34404613461.

16431640443 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 1 + 640 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 16431640443 - 2³² = 12136673147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16431640398 and 16431640407.

It is not an unprimeable number, because it can be changed into a prime (16431640483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274768 + ... + 329181.

It is an arithmetic number, because the mean of its divisors is an integer number (1978540200).

Almost surely, 2^16431640443 is an apocalyptic number.

16431640443 is a deficient number, since it is larger than the sum of its proper divisors (7310841957).

16431640443 is a wasteful number, since it uses less digits than its factorization.

16431640443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606978 (or 606975 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 16431640443 in words is "sixteen billion, four hundred thirty-one million, six hundred forty thousand, four hundred forty-three".