20645473410899 has 2 divisors, whose sum is σ = 20645473410900. Its totient is φ = 20645473410898.

The previous prime is 20645473410883. The next prime is 20645473410917. The reversal of 20645473410899 is 99801437454602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20645473410899 - 2⁴ = 20645473410883 is a prime.

It is not a weakly prime, because it can be changed into another prime (20645473410829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322736705449 + 10322736705450.

It is an arithmetic number, because the mean of its divisors is an integer number (10322736705450).

It is a 1-persistent number, because it is pandigital, but 2⋅20645473410899 = 41290946821798 is not.

Almost surely, 2^{20645473410899} is an apocalyptic number.

20645473410899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645473410899 is an equidigital number, since it uses as much as digits as its factorization.

20645473410899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 62.

The spelling of 20645473410899 in words is "twenty trillion, six hundred forty-five billion, four hundred seventy-three million, four hundred ten thousand, eight hundred ninety-nine".