12164121656 has 16 divisors (see below), whose sum is σ = 24149359440. Its totient is φ = 5724292480.

The previous prime is 12164121649. The next prime is 12164121677. The reversal of 12164121656 is 65612146121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44720900 + ... + 44721171.

It is an arithmetic number, because the mean of its divisors is an integer number (1509334965).

Almost surely, 2^12164121656 is an apocalyptic number.

It is an amenable number.

12164121656 is a deficient number, since it is larger than the sum of its proper divisors (11985237784).

12164121656 is a wasteful number, since it uses less digits than its factorization.

12164121656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89442094 (or 89442090 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

Adding to 12164121656 its reverse (65612146121), we get a palindrome (77776267777).

The spelling of 12164121656 in words is "twelve billion, one hundred sixty-four million, one hundred twenty-one thousand, six hundred fifty-six".