181381212552 has 48 divisors (see below), whose sum is σ = 478575105840. Its totient is φ = 57278274912.

The previous prime is 181381212541. The next prime is 181381212553. The reversal of 181381212552 is 255212183181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 181381212552.

It is not an unprimeable number, because it can be changed into a prime (181381212553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10458858 + ... + 10476185.

It is an arithmetic number, because the mean of its divisors is an integer number (9970314705).

Almost surely, 2^181381212552 is an apocalyptic number.

181381212552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181381212552 is an abundant number, since it is smaller than the sum of its proper divisors (297193893288).

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

181381212552 is a wasteful number, since it uses less digits than its factorization.

181381212552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20935090 (or 20935067 counting only the distinct ones).

The product of its digits is 38400, while the sum is 39.

The spelling of 181381212552 in words is "one hundred eighty-one billion, three hundred eighty-one million, two hundred twelve thousand, five hundred fifty-two".