16438021807 has 2 divisors, whose sum is σ = 16438021808. Its totient is φ = 16438021806.

The previous prime is 16438021763. The next prime is 16438021843. The reversal of 16438021807 is 70812083461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16438021807 - 2⁷ = 16438021679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16438021807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16438021307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8219010903 + 8219010904.

It is an arithmetic number, because the mean of its divisors is an integer number (8219010904).

Almost surely, 2^16438021807 is an apocalyptic number.

16438021807 is a deficient number, since it is larger than the sum of its proper divisors (1).

16438021807 is an equidigital number, since it uses as much as digits as its factorization.

16438021807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 16438021807 in words is "sixteen billion, four hundred thirty-eight million, twenty-one thousand, eight hundred seven".