12181037656 has 8 divisors (see below), whose sum is σ = 22839445620. Its totient is φ = 6090518824.

The previous prime is 12181037641. The next prime is 12181037663. The reversal of 12181037656 is 65673018121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 761314846 + ... + 761314861.

Almost surely, 2^12181037656 is an apocalyptic number.

It is an amenable number.

12181037656 is a deficient number, since it is larger than the sum of its proper divisors (10658407964).

12181037656 is a wasteful number, since it uses less digits than its factorization.

12181037656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522629713 (or 1522629709 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 12181037656 in words is "twelve billion, one hundred eighty-one million, thirty-seven thousand, six hundred fifty-six".