16390787887 has 2 divisors, whose sum is σ = 16390787888. Its totient is φ = 16390787886.

The previous prime is 16390787867. The next prime is 16390787891. The reversal of 16390787887 is 78878709361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16390787887 - 2³¹ = 14243304239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16390787837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195393943 + 8195393944.

It is an arithmetic number, because the mean of its divisors is an integer number (8195393944).

Almost surely, 2^16390787887 is an apocalyptic number.

16390787887 is a deficient number, since it is larger than the sum of its proper divisors (1).

16390787887 is an equidigital number, since it uses as much as digits as its factorization.

16390787887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 16390787887 in words is "sixteen billion, three hundred ninety million, seven hundred eighty-seven thousand, eight hundred eighty-seven".