12573335781 has 8 divisors (see below), whose sum is σ = 18627164160. Its totient is φ = 8382223836.

The previous prime is 12573335717. The next prime is 12573335891. The reversal of 12573335781 is 18753337521.

12573335781 is a `hidden beast` number, since 1 + 2 + 5 + 73 + 3 + 3 + 578 + 1 = 666.

It is not a de Polignac number, because 12573335781 - 2⁶ = 12573335717 is a prime.

It is a super-2 number, since 2×12573335781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12573335081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232839525 + ... + 232839578.

It is an arithmetic number, because the mean of its divisors is an integer number (2328395520).

Almost surely, 2^12573335781 is an apocalyptic number.

It is an amenable number.

12573335781 is a deficient number, since it is larger than the sum of its proper divisors (6053828379).

12573335781 is an equidigital number, since it uses as much as digits as its factorization.

12573335781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465679112 (or 465679106 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

It can be divided in two parts, 12573335 and 781, that added together give a square (12574116 = 3546²).

The spelling of 12573335781 in words is "twelve billion, five hundred seventy-three million, three hundred thirty-five thousand, seven hundred eighty-one".