20201686645331 has 2 divisors, whose sum is σ = 20201686645332. Its totient is φ = 20201686645330.

The previous prime is 20201686645321. The next prime is 20201686645391. The reversal of 20201686645331 is 13354668610202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201686645331 - 2¹⁴ = 20201686628947 is a prime.

It is a super-2 number, since 2×20201686645331² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20201686645321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100843322665 + 10100843322666.

It is an arithmetic number, because the mean of its divisors is an integer number (10100843322666).

Almost surely, 2^{20201686645331} is an apocalyptic number.

20201686645331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201686645331 is an equidigital number, since it uses as much as digits as its factorization.

20201686645331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20201686645331 in words is "twenty trillion, two hundred one billion, six hundred eighty-six million, six hundred forty-five thousand, three hundred thirty-one".