11812557836 has 6 divisors (see below), whose sum is σ = 20671976220. Its totient is φ = 5906278916.

The previous prime is 11812557817. The next prime is 11812557839. The reversal of 11812557836 is 63875521811.

It is not an unprimeable number, because it can be changed into a prime (11812557839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1476569726 + ... + 1476569733.

It is an arithmetic number, because the mean of its divisors is an integer number (3445329370).

Almost surely, 2^11812557836 is an apocalyptic number.

It is an amenable number.

11812557836 is a deficient number, since it is larger than the sum of its proper divisors (8859418384).

11812557836 is a wasteful number, since it uses less digits than its factorization.

11812557836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953139463 (or 2953139461 counting only the distinct ones).

The product of its digits is 403200, while the sum is 47.

The spelling of 11812557836 in words is "eleven billion, eight hundred twelve million, five hundred fifty-seven thousand, eight hundred thirty-six".