20451243561607 has 2 divisors, whose sum is σ = 20451243561608. Its totient is φ = 20451243561606.

The previous prime is 20451243561563. The next prime is 20451243561677. The reversal of 20451243561607 is 70616534215402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20451243561607 - 2³¹ = 20449096077959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20451243561677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225621780803 + 10225621780804.

It is an arithmetic number, because the mean of its divisors is an integer number (10225621780804).

Almost surely, 2^{20451243561607} is an apocalyptic number.

20451243561607 is a deficient number, since it is larger than the sum of its proper divisors (1).

20451243561607 is an equidigital number, since it uses as much as digits as its factorization.

20451243561607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 20451243561607 in words is "twenty trillion, four hundred fifty-one billion, two hundred forty-three million, five hundred sixty-one thousand, six hundred seven".