16687799 has 2 divisors, whose sum is σ = 16687800. Its totient is φ = 16687798.

The previous prime is 16687787. The next prime is 16687819. The reversal of 16687799 is 99778661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16687799 - 2¹² = 16683703 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16687799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16687729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343899 + 8343900.

It is an arithmetic number, because the mean of its divisors is an integer number (8343900).

Almost surely, 2^16687799 is an apocalyptic number.

16687799 is a deficient number, since it is larger than the sum of its proper divisors (1).

16687799 is an equidigital number, since it uses as much as digits as its factorization.

16687799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 16687799 is about 4085.0702564338. The cubic root of 16687799 is about 255.5443912437.

The spelling of 16687799 in words is "sixteen million, six hundred eighty-seven thousand, seven hundred ninety-nine".