18627681389 has 16 divisors (see below), whose sum is σ = 19476288000. Its totient is φ = 17793115200.

The previous prime is 18627681383. The next prime is 18627681431. The reversal of 18627681389 is 98318672681.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18627681389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18627681383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6849572 + ... + 6852290.

It is an arithmetic number, because the mean of its divisors is an integer number (1217268000).

Almost surely, 2^18627681389 is an apocalyptic number.

It is an amenable number.

18627681389 is a deficient number, since it is larger than the sum of its proper divisors (848606611).

18627681389 is a wasteful number, since it uses less digits than its factorization.

18627681389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5188.

The product of its digits is 6967296, while the sum is 59.

The spelling of 18627681389 in words is "eighteen billion, six hundred twenty-seven million, six hundred eighty-one thousand, three hundred eighty-nine".