18781625567 has 2 divisors, whose sum is σ = 18781625568. Its totient is φ = 18781625566.

The previous prime is 18781625543. The next prime is 18781625581. The reversal of 18781625567 is 76552618781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18781625567 - 2²² = 18777431263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18781625587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9390812783 + 9390812784.

It is an arithmetic number, because the mean of its divisors is an integer number (9390812784).

Almost surely, 2^18781625567 is an apocalyptic number.

18781625567 is a deficient number, since it is larger than the sum of its proper divisors (1).

18781625567 is an equidigital number, since it uses as much as digits as its factorization.

18781625567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 56.

The spelling of 18781625567 in words is "eighteen billion, seven hundred eighty-one million, six hundred twenty-five thousand, five hundred sixty-seven".