12156331623 has 4 divisors (see below), whose sum is σ = 16208442168. Its totient is φ = 8104221080.

The previous prime is 12156331609. The next prime is 12156331631. The reversal of 12156331623 is 32613365121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12156331623 - 2¹⁸ = 12156069479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156331123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026055268 + ... + 2026055273.

It is an arithmetic number, because the mean of its divisors is an integer number (4052110542).

Almost surely, 2^12156331623 is an apocalyptic number.

12156331623 is a deficient number, since it is larger than the sum of its proper divisors (4052110545).

12156331623 is an equidigital number, since it uses as much as digits as its factorization.

12156331623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052110544.

The product of its digits is 19440, while the sum is 33.

Adding to 12156331623 its reverse (32613365121), we get a palindrome (44769696744).

The spelling of 12156331623 in words is "twelve billion, one hundred fifty-six million, three hundred thirty-one thousand, six hundred twenty-three".