19900010887 has 2 divisors, whose sum is σ = 19900010888. Its totient is φ = 19900010886.

The previous prime is 19900010839. The next prime is 19900010951. The reversal of 19900010887 is 78801000991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19900010887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900010087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950005443 + 9950005444.

It is an arithmetic number, because the mean of its divisors is an integer number (9950005444).

Almost surely, 2^19900010887 is an apocalyptic number.

19900010887 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900010887 is an equidigital number, since it uses as much as digits as its factorization.

19900010887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 19900010887 in words is "nineteen billion, nine hundred million, ten thousand, eight hundred eighty-seven".