16400803691 has 2 divisors, whose sum is σ = 16400803692. Its totient is φ = 16400803690.

The previous prime is 16400803663. The next prime is 16400803733. The reversal of 16400803691 is 19630800461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16400803691 is a prime.

It is not a weakly prime, because it can be changed into another prime (16400203691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200401845 + 8200401846.

It is an arithmetic number, because the mean of its divisors is an integer number (8200401846).

Almost surely, 2^16400803691 is an apocalyptic number.

16400803691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400803691 is an equidigital number, since it uses as much as digits as its factorization.

16400803691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 16400803691 in words is "sixteen billion, four hundred million, eight hundred three thousand, six hundred ninety-one".