12156401632 has 12 divisors (see below), whose sum is σ = 23932915776. Its totient is φ = 6078200800.

The previous prime is 12156401617. The next prime is 12156401639. The reversal of 12156401632 is 23610465121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12156401594 and 12156401603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156401639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189943744 + ... + 189943807.

It is an arithmetic number, because the mean of its divisors is an integer number (1994409648).

Almost surely, 2^12156401632 is an apocalyptic number.

It is an amenable number.

12156401632 is a deficient number, since it is larger than the sum of its proper divisors (11776514144).

12156401632 is an equidigital number, since it uses as much as digits as its factorization.

12156401632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379887561 (or 379887553 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 12156401632 its reverse (23610465121), we get a palindrome (35766866753).

The spelling of 12156401632 in words is "twelve billion, one hundred fifty-six million, four hundred one thousand, six hundred thirty-two".