20145145393081 has 2 divisors, whose sum is σ = 20145145393082. Its totient is φ = 20145145393080.

The previous prime is 20145145393013. The next prime is 20145145393099. The reversal of 20145145393081 is 18039354154102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20124240860025 + 20904533056 = 4486005^2 + 144584^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145145393081 - 2³³ = 20136555458489 is a prime.

It is a super-2 number, since 2×20145145393081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20145145393001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072572696540 + 10072572696541.

It is an arithmetic number, because the mean of its divisors is an integer number (10072572696541).

Almost surely, 2^{20145145393081} is an apocalyptic number.

It is an amenable number.

20145145393081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145145393081 is an equidigital number, since it uses as much as digits as its factorization.

20145145393081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 20145145393081 in words is "twenty trillion, one hundred forty-five billion, one hundred forty-five million, three hundred ninety-three thousand, eighty-one".