12261555342 has 24 divisors (see below), whose sum is σ = 27964951560. Its totient is φ = 3872070000.

The previous prime is 12261555331. The next prime is 12261555359. The reversal of 12261555342 is 24355516221.

12261555342 is a `hidden beast` number, since 1 + 2 + 2 + 61 + 5 + 553 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 12261555297 and 12261555306.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 17925909 + ... + 17926592.

It is an arithmetic number, because the mean of its divisors is an integer number (1165206315).

Almost surely, 2^12261555342 is an apocalyptic number.

12261555342 is an abundant number, since it is smaller than the sum of its proper divisors (15703396218).

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

12261555342 is a wasteful number, since it uses less digits than its factorization.

12261555342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35852528 (or 35852525 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The spelling of 12261555342 in words is "twelve billion, two hundred sixty-one million, five hundred fifty-five thousand, three hundred forty-two".