12555351521442 has 12 divisors (see below), whose sum is σ = 27203261629830. Its totient is φ = 4185117173808.

The previous prime is 12555351521399. The next prime is 12555351521443. The reversal of 12555351521442 is 24412515355521.

12555351521442 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 53 + 5 + 152 + 1 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12338576542161 + 216774979281 = 3512631^2 + 465591^2 .

It is not an unprimeable number, because it can be changed into a prime (12555351521443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 348759764467 + ... + 348759764502.

Almost surely, 2^{12555351521442} is an apocalyptic number.

12555351521442 is an abundant number, since it is smaller than the sum of its proper divisors (14647910108388).

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

12555351521442 is a wasteful number, since it uses less digits than its factorization.

12555351521442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697519528977 (or 697519528974 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 45.

Adding to 12555351521442 its reverse (24412515355521), we get a palindrome (36967866876963).

The spelling of 12555351521442 in words is "twelve trillion, five hundred fifty-five billion, three hundred fifty-one million, five hundred twenty-one thousand, four hundred forty-two".