215555434451 has 12 divisors (see below), whose sum is σ = 250984106352. Its totient is φ = 184587944688.

The previous prime is 215555434421. The next prime is 215555434477. The reversal of 215555434451 is 154434555512.

It is a happy number.

215555434451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-215555434451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215555434421) by changing a digit.

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, 2017100 + ... + 2121273.

It is an arithmetic number, because the mean of its divisors is an integer number (20915342196).

Almost surely, 2^215555434451 is an apocalyptic number.

215555434451 is a deficient number, since it is larger than the sum of its proper divisors (35428671901).

215555434451 is a wasteful number, since it uses less digits than its factorization.

215555434451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139450 (or 4139443 counting only the distinct ones).

The product of its digits is 1200000, while the sum is 44.

Adding to 215555434451 its reverse (154434555512), we get a palindrome (369989989963).

The spelling of 215555434451 in words is "two hundred fifteen billion, five hundred fifty-five million, four hundred thirty-four thousand, four hundred fifty-one".