12155331742 has 8 divisors (see below), whose sum is σ = 18252376632. Its totient is φ = 6071206200.

The previous prime is 12155331739. The next prime is 12155331743. The reversal of 12155331742 is 24713355121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12155331698 and 12155331707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155331743) 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, 3227484 + ... + 3231247.

It is an arithmetic number, because the mean of its divisors is an integer number (2281547079).

Almost surely, 2^12155331742 is an apocalyptic number.

12155331742 is a deficient number, since it is larger than the sum of its proper divisors (6097044890).

12155331742 is an equidigital number, since it uses as much as digits as its factorization.

12155331742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459674.

The product of its digits is 25200, while the sum is 34.

Adding to 12155331742 its reverse (24713355121), we get a palindrome (36868686863).

The spelling of 12155331742 in words is "twelve billion, one hundred fifty-five million, three hundred thirty-one thousand, seven hundred forty-two".