818261402655 has 32 divisors (see below), whose sum is σ = 1337367974400. Its totient is φ = 427094743680.

The previous prime is 818261402641. The next prime is 818261402687. The reversal of 818261402655 is 556204162818.

It is not a de Polignac number, because 818261402655 - 2²⁴ = 818244625439 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 2064837 + ... + 2429006.

It is an arithmetic number, because the mean of its divisors is an integer number (41792749200).

Almost surely, 2^818261402655 is an apocalyptic number.

818261402655 is a deficient number, since it is larger than the sum of its proper divisors (519106571745).

818261402655 is a wasteful number, since it uses less digits than its factorization.

818261402655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494111.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 818261402655 in words is "eight hundred eighteen billion, two hundred sixty-one million, four hundred two thousand, six hundred fifty-five".