12645365645554 has 24 divisors (see below), whose sum is σ = 19647125353908. Its totient is φ = 6103897282560.

The previous prime is 12645365645551. The next prime is 12645365645581. The reversal of 12645365645554 is 45554656354621.

It can be written as a sum of positive squares in 6 ways, for example, as 2407701512329 + 10237664133225 = 1551677^2 + 3199635^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12645365645492 and 12645365645501.

It is not an unprimeable number, because it can be changed into a prime (12645365645551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13127074 + ... + 14057410.

Almost surely, 2^{12645365645554} is an apocalyptic number.

12645365645554 is a deficient number, since it is larger than the sum of its proper divisors (7001759708354).

12645365645554 is an equidigital number, since it uses as much as digits as its factorization.

12645365645554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938478 (or 938449 counting only the distinct ones).

The product of its digits is 259200000, while the sum is 61.

The spelling of 12645365645554 in words is "twelve trillion, six hundred forty-five billion, three hundred sixty-five million, six hundred forty-five thousand, five hundred fifty-four".