11816820656 has 10 divisors (see below), whose sum is σ = 22895090052. Its totient is φ = 5908410320.

The previous prime is 11816820643. The next prime is 11816820703. The reversal of 11816820656 is 65602861811.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369275630 + ... + 369275661.

Almost surely, 2^11816820656 is an apocalyptic number.

11816820656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11816820656 is a deficient number, since it is larger than the sum of its proper divisors (11078269396).

11816820656 is an equidigital number, since it uses as much as digits as its factorization.

11816820656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738551299 (or 738551293 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 11816820656 in words is "eleven billion, eight hundred sixteen million, eight hundred twenty thousand, six hundred fifty-six".