19694665740391 has 2 divisors, whose sum is σ = 19694665740392. Its totient is φ = 19694665740390.

The previous prime is 19694665740371. The next prime is 19694665740397. The reversal of 19694665740391 is 19304756649691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19694665740391 - 2⁵ = 19694665740359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19694665740391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19694665740397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9847332870195 + 9847332870196.

It is an arithmetic number, because the mean of its divisors is an integer number (9847332870196).

Almost surely, 2^{19694665740391} is an apocalyptic number.

19694665740391 is a deficient number, since it is larger than the sum of its proper divisors (1).

19694665740391 is an equidigital number, since it uses as much as digits as its factorization.

19694665740391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264539520, while the sum is 70.

The spelling of 19694665740391 in words is "nineteen trillion, six hundred ninety-four billion, six hundred sixty-five million, seven hundred forty thousand, three hundred ninety-one".