12181405616 has 10 divisors (see below), whose sum is σ = 23601473412. Its totient is φ = 6090702800.

The previous prime is 12181405591. The next prime is 12181405637. The reversal of 12181405616 is 61650418121.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380668910 + ... + 380668941.

Almost surely, 2^12181405616 is an apocalyptic number.

12181405616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12181405616 is a deficient number, since it is larger than the sum of its proper divisors (11420067796).

12181405616 is an equidigital number, since it uses as much as digits as its factorization.

12181405616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761337859 (or 761337853 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 12181405616 in words is "twelve billion, one hundred eighty-one million, four hundred five thousand, six hundred sixteen".