20560953449 has 2 divisors, whose sum is σ = 20560953450. Its totient is φ = 20560953448.

The previous prime is 20560953443. The next prime is 20560953463. The reversal of 20560953449 is 94435906502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11582064400 + 8978889049 = 107620^2 + 94757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20560953449 is a prime.

It is a super-3 number, since 3×20560953449³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20560953443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10280476724 + 10280476725.

It is an arithmetic number, because the mean of its divisors is an integer number (10280476725).

Almost surely, 2^20560953449 is an apocalyptic number.

It is an amenable number.

20560953449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20560953449 is an equidigital number, since it uses as much as digits as its factorization.

20560953449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 20560953449 in words is "twenty billion, five hundred sixty million, nine hundred fifty-three thousand, four hundred forty-nine".