2181302433655 has 16 divisors (see below), whose sum is σ = 2759929344000. Its totient is φ = 1650437661600.

The previous prime is 2181302433571. The next prime is 2181302433659. The reversal of 2181302433655 is 5563342031812.

It is a happy number.

It is not a de Polignac number, because 2181302433655 - 2⁹ = 2181302433143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181302433659) 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, 19109271 + ... + 19223080.

It is an arithmetic number, because the mean of its divisors is an integer number (172495584000).

Almost surely, 2^{2181302433655} is an apocalyptic number.

2181302433655 is a deficient number, since it is larger than the sum of its proper divisors (578626910345).

2181302433655 is a wasteful number, since it uses less digits than its factorization.

2181302433655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38332974.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 2181302433655 in words is "two trillion, one hundred eighty-one billion, three hundred two million, four hundred thirty-three thousand, six hundred fifty-five".