20415766923361 has 2 divisors, whose sum is σ = 20415766923362. Its totient is φ = 20415766923360.

The previous prime is 20415766923353. The next prime is 20415766923379. The reversal of 20415766923361 is 16332966751402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20315582012961 + 100184910400 = 4507281^2 + 316520^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415766923361 - 2³ = 20415766923353 is a prime.

It is not a weakly prime, because it can be changed into another prime (20415766923161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207883461680 + 10207883461681.

It is an arithmetic number, because the mean of its divisors is an integer number (10207883461681).

Almost surely, 2^{20415766923361} is an apocalyptic number.

It is an amenable number.

20415766923361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415766923361 is an equidigital number, since it uses as much as digits as its factorization.

20415766923361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 20415766923361 in words is "twenty trillion, four hundred fifteen billion, seven hundred sixty-six million, nine hundred twenty-three thousand, three hundred sixty-one".