12071331556 has 6 divisors (see below), whose sum is σ = 21124830230. Its totient is φ = 6035665776.

The previous prime is 12071331551. The next prime is 12071331557. The reversal of 12071331556 is 65513317021.

It can be written as a sum of positive squares in only one way, i.e., 10225254400 + 1846077156 = 101120^2 + 42966^2 .

It is a super-2 number, since 2×12071331556² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12071331551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1508916441 + ... + 1508916448.

Almost surely, 2^12071331556 is an apocalyptic number.

It is an amenable number.

12071331556 is a deficient number, since it is larger than the sum of its proper divisors (9053498674).

12071331556 is a wasteful number, since it uses less digits than its factorization.

12071331556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017832893 (or 3017832891 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 34.

Adding to 12071331556 its reverse (65513317021), we get a palindrome (77584648577).

The spelling of 12071331556 in words is "twelve billion, seventy-one million, three hundred thirty-one thousand, five hundred fifty-six".