20645463457741 has 2 divisors, whose sum is σ = 20645463457742. Its totient is φ = 20645463457740.

The previous prime is 20645463457643. The next prime is 20645463457789. The reversal of 20645463457741 is 14775436454602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15782710780516 + 4862752677225 = 3972746^2 + 2205165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20645463457741 - 2¹¹ = 20645463455693 is a prime.

It is a super-2 number, since 2×20645463457741² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20645463455741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322731728870 + 10322731728871.

It is an arithmetic number, because the mean of its divisors is an integer number (10322731728871).

Almost surely, 2^{20645463457741} is an apocalyptic number.

It is an amenable number.

20645463457741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645463457741 is an equidigital number, since it uses as much as digits as its factorization.

20645463457741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67737600, while the sum is 58.

The spelling of 20645463457741 in words is "twenty trillion, six hundred forty-five billion, four hundred sixty-three million, four hundred fifty-seven thousand, seven hundred forty-one".