12605991803 has 4 divisors (see below), whose sum is σ = 12606627840. Its totient is φ = 12605355768.

The previous prime is 12605991779. The next prime is 12605991857. The reversal of 12605991803 is 30819950621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30819950621 = 67 ⋅459999263.

It is a cyclic number.

It is not a de Polignac number, because 12605991803 - 2³² = 8311024507 is a prime.

It is a super-2 number, since 2×12605991803² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12605991403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287300 + ... + 328257.

It is an arithmetic number, because the mean of its divisors is an integer number (3151656960).

Almost surely, 2^12605991803 is an apocalyptic number.

12605991803 is a deficient number, since it is larger than the sum of its proper divisors (636037).

12605991803 is an equidigital number, since it uses as much as digits as its factorization.

12605991803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636036.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 12605991803 in words is "twelve billion, six hundred five million, nine hundred ninety-one thousand, eight hundred three".