19905374863939 has 2 divisors, whose sum is σ = 19905374863940. Its totient is φ = 19905374863938.

The previous prime is 19905374863909. The next prime is 19905374863961. The reversal of 19905374863939 is 93936847350991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19905374863939 - 2¹⁵ = 19905374831171 is a prime.

It is a super-3 number, since 3×19905374863939³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (19905374863909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9952687431969 + 9952687431970.

It is an arithmetic number, because the mean of its divisors is an integer number (9952687431970).

Almost surely, 2^{19905374863939} is an apocalyptic number.

19905374863939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19905374863939 is an equidigital number, since it uses as much as digits as its factorization.

19905374863939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1190427840, while the sum is 76.

The spelling of 19905374863939 in words is "nineteen trillion, nine hundred five billion, three hundred seventy-four million, eight hundred sixty-three thousand, nine hundred thirty-nine".