18856472087 has 2 divisors, whose sum is σ = 18856472088. Its totient is φ = 18856472086.

The previous prime is 18856471981. The next prime is 18856472153. The reversal of 18856472087 is 78027465881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18856472087 - 2¹⁰ = 18856471063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18856432087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428236043 + 9428236044.

It is an arithmetic number, because the mean of its divisors is an integer number (9428236044).

Almost surely, 2^18856472087 is an apocalyptic number.

18856472087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856472087 is an equidigital number, since it uses as much as digits as its factorization.

18856472087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 18856472087 in words is "eighteen billion, eight hundred fifty-six million, four hundred seventy-two thousand, eighty-seven".