12155547642 has 32 divisors (see below), whose sum is σ = 27831019392. Its totient is φ = 3467149824.

The previous prime is 12155547619. The next prime is 12155547647. The reversal of 12155547642 is 24674555121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 12155547594 and 12155547603.

It is not an unprimeable number, because it can be changed into a prime (12155547647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219123 + ... + 268934.

It is an arithmetic number, because the mean of its divisors is an integer number (869719356).

Almost surely, 2^12155547642 is an apocalyptic number.

12155547642 is an abundant number, since it is smaller than the sum of its proper divisors (15675471750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12155547642 is a wasteful number, since it uses less digits than its factorization.

12155547642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488662.

The product of its digits is 336000, while the sum is 42.

The spelling of 12155547642 in words is "twelve billion, one hundred fifty-five million, five hundred forty-seven thousand, six hundred forty-two".