16194778499 has 2 divisors, whose sum is σ = 16194778500. Its totient is φ = 16194778498.

The previous prime is 16194778487. The next prime is 16194778519. The reversal of 16194778499 is 99487749161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16194778499 is a prime.

It is not a weakly prime, because it can be changed into another prime (16194778199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8097389249 + 8097389250.

It is an arithmetic number, because the mean of its divisors is an integer number (8097389250).

Almost surely, 2^16194778499 is an apocalyptic number.

16194778499 is a deficient number, since it is larger than the sum of its proper divisors (1).

16194778499 is an equidigital number, since it uses as much as digits as its factorization.

16194778499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 65.

The spelling of 16194778499 in words is "sixteen billion, one hundred ninety-four million, seven hundred seventy-eight thousand, four hundred ninety-nine".