20346665402449 has 2 divisors, whose sum is σ = 20346665402450. Its totient is φ = 20346665402448.

The previous prime is 20346665402407. The next prime is 20346665402489. The reversal of 20346665402449 is 94420456664302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18953658816400 + 1393006586049 = 4353580^2 + 1180257^2 .

It is a cyclic number.

It is not a de Polignac number, because 20346665402449 - 2¹⁹ = 20346664878161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20346665402449.

It is not a weakly prime, because it can be changed into another prime (20346665402489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10173332701224 + 10173332701225.

It is an arithmetic number, because the mean of its divisors is an integer number (10173332701225).

Almost surely, 2^{20346665402449} is an apocalyptic number.

It is an amenable number.

20346665402449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20346665402449 is an equidigital number, since it uses as much as digits as its factorization.

20346665402449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29859840, while the sum is 55.

The spelling of 20346665402449 in words is "twenty trillion, three hundred forty-six billion, six hundred sixty-five million, four hundred two thousand, four hundred forty-nine".