18949173253039 has 2 divisors, whose sum is σ = 18949173253040. Its totient is φ = 18949173253038.

The previous prime is 18949173252979. The next prime is 18949173253067. The reversal of 18949173253039 is 93035237194981.

It is a strong prime.

It is an emirp because it is prime and its reverse (93035237194981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18949173253039 - 2¹⁹ = 18949172728751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18949173253099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474586626519 + 9474586626520.

It is an arithmetic number, because the mean of its divisors is an integer number (9474586626520).

Almost surely, 2^{18949173253039} is an apocalyptic number.

18949173253039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949173253039 is an equidigital number, since it uses as much as digits as its factorization.

18949173253039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 18949173253039 in words is "eighteen trillion, nine hundred forty-nine billion, one hundred seventy-three million, two hundred fifty-three thousand, thirty-nine".