1923664839647 has 2 divisors, whose sum is σ = 1923664839648. Its totient is φ = 1923664839646.

The previous prime is 1923664839643. The next prime is 1923664839653. The reversal of 1923664839647 is 7469384663291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1923664839647 - 2² = 1923664839643 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1923664839643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 961832419823 + 961832419824.

It is an arithmetic number, because the mean of its divisors is an integer number (961832419824).

Almost surely, 2^{1923664839647} is an apocalyptic number.

1923664839647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1923664839647 is an equidigital number, since it uses as much as digits as its factorization.

1923664839647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282175488, while the sum is 68.

The spelling of 1923664839647 in words is "one trillion, nine hundred twenty-three billion, six hundred sixty-four million, eight hundred thirty-nine thousand, six hundred forty-seven".