11781635556 has 24 divisors (see below), whose sum is σ = 27502453440. Its totient is φ = 3925501792.

The previous prime is 11781635531. The next prime is 11781635563. The reversal of 11781635556 is 65553618711.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184896 + ... + 240311.

It is an arithmetic number, because the mean of its divisors is an integer number (1145935560).

Almost surely, 2^11781635556 is an apocalyptic number.

It is an amenable number.

11781635556 is an abundant number, since it is smaller than the sum of its proper divisors (15720817884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11781635556 is a wasteful number, since it uses less digits than its factorization.

11781635556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427523 (or 427521 counting only the distinct ones).

The product of its digits is 756000, while the sum is 48.

The spelling of 11781635556 in words is "eleven billion, seven hundred eighty-one million, six hundred thirty-five thousand, five hundred fifty-six".