11812663636 has 12 divisors (see below), whose sum is σ = 20762434420. Its totient is φ = 5880539520.

The previous prime is 11812663631. The next prime is 11812663693. The reversal of 11812663636 is 63636621811.

It can be written as a sum of positive squares in 2 ways, for example, as 10558795536 + 1253868100 = 102756^2 + 35410^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11812663592 and 11812663601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11812663631) 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, 6447045 + ... + 6448876.

Almost surely, 2^11812663636 is an apocalyptic number.

It is an amenable number.

11812663636 is a deficient number, since it is larger than the sum of its proper divisors (8949770784).

11812663636 is a wasteful number, since it uses less digits than its factorization.

11812663636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12896154 (or 12896152 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The spelling of 11812663636 in words is "eleven billion, eight hundred twelve million, six hundred sixty-three thousand, six hundred thirty-six".