20013721565627 has 2 divisors, whose sum is σ = 20013721565628. Its totient is φ = 20013721565626.

The previous prime is 20013721565611. The next prime is 20013721565633. The reversal of 20013721565627 is 72656512731002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20013721565627 - 2⁴ = 20013721565611 is a prime.

It is not a weakly prime, because it can be changed into another prime (20013721561627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006860782813 + 10006860782814.

It is an arithmetic number, because the mean of its divisors is an integer number (10006860782814).

Almost surely, 2^{20013721565627} is an apocalyptic number.

20013721565627 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013721565627 is an equidigital number, since it uses as much as digits as its factorization.

20013721565627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 20013721565627 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, five hundred sixty-five thousand, six hundred twenty-seven".