17949981931867 has 2 divisors, whose sum is σ = 17949981931868. Its totient is φ = 17949981931866.

The previous prime is 17949981931781. The next prime is 17949981931939. The reversal of 17949981931867 is 76813918994971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17949981931867 - 2²³ = 17949973543259 is a prime.

It is not a weakly prime, because it can be changed into another prime (17949981934867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8974990965933 + 8974990965934.

It is an arithmetic number, because the mean of its divisors is an integer number (8974990965934).

Almost surely, 2^{17949981931867} is an apocalyptic number.

17949981931867 is a deficient number, since it is larger than the sum of its proper divisors (1).

17949981931867 is an equidigital number, since it uses as much as digits as its factorization.

17949981931867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481421312, while the sum is 82.

The spelling of 17949981931867 in words is "seventeen trillion, nine hundred forty-nine billion, nine hundred eighty-one million, nine hundred thirty-one thousand, eight hundred sixty-seven".