13603779668 has 12 divisors (see below), whose sum is σ = 23828403060. Its totient is φ = 6795664512.

The previous prime is 13603779653. The next prime is 13603779767. The reversal of 13603779668 is 86697730631.

It can be written as a sum of positive squares in 2 ways, for example, as 12385909264 + 1217870404 = 111292^2 + 34898^2 .

It is a super-4 number, since 4×13603779668⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551413 + ... + 1560156.

It is an arithmetic number, because the mean of its divisors is an integer number (1985700255).

Almost surely, 2^13603779668 is an apocalyptic number.

It is an amenable number.

13603779668 is a deficient number, since it is larger than the sum of its proper divisors (10224623392).

13603779668 is a wasteful number, since it uses less digits than its factorization.

13603779668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112666 (or 3112664 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 13603779668 in words is "thirteen billion, six hundred three million, seven hundred seventy-nine thousand, six hundred sixty-eight".