18681673966939 has 2 divisors, whose sum is σ = 18681673966940. Its totient is φ = 18681673966938.

The previous prime is 18681673966913. The next prime is 18681673966961. The reversal of 18681673966939 is 93966937618681.

It is a strong prime.

It is an emirp because it is prime and its reverse (93966937618681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18681673966939 - 2⁷ = 18681673966811 is a prime.

It is not a weakly prime, because it can be changed into another prime (18681673966639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9340836983469 + 9340836983470.

It is an arithmetic number, because the mean of its divisors is an integer number (9340836983470).

Almost surely, 2^{18681673966939} is an apocalyptic number.

18681673966939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18681673966939 is an equidigital number, since it uses as much as digits as its factorization.

18681673966939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3809369088, while the sum is 82.

The spelling of 18681673966939 in words is "eighteen trillion, six hundred eighty-one billion, six hundred seventy-three million, nine hundred sixty-six thousand, nine hundred thirty-nine".