20268178453 has 2 divisors, whose sum is σ = 20268178454. Its totient is φ = 20268178452.

The previous prime is 20268178391. The next prime is 20268178477. The reversal of 20268178453 is 35487186202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15429863089 + 4838315364 = 124217^2 + 69558^2 .

It is a cyclic number.

It is not a de Polignac number, because 20268178453 - 2¹⁷ = 20268047381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20268178153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134089226 + 10134089227.

It is an arithmetic number, because the mean of its divisors is an integer number (10134089227).

Almost surely, 2^20268178453 is an apocalyptic number.

It is an amenable number.

20268178453 is a deficient number, since it is larger than the sum of its proper divisors (1).

20268178453 is an equidigital number, since it uses as much as digits as its factorization.

20268178453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20268178453 in words is "twenty billion, two hundred sixty-eight million, one hundred seventy-eight thousand, four hundred fifty-three".