1821311640255 has 32 divisors (see below), whose sum is σ = 2929597272000. Its totient is φ = 966213614592.

The previous prime is 1821311640221. The next prime is 1821311640257. The reversal of 1821311640255 is 5520461131281.

It is not a de Polignac number, because 1821311640255 - 2²¹ = 1821309543103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821311640257) 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 31 ways as a sum of consecutive naturals, for example, 1715797 + ... + 2566433.

It is an arithmetic number, because the mean of its divisors is an integer number (91549914750).

Almost surely, 2^{1821311640255} is an apocalyptic number.

1821311640255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1821311640255 is a deficient number, since it is larger than the sum of its proper divisors (1108285631745).

1821311640255 is a wasteful number, since it uses less digits than its factorization.

1821311640255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851403.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 1821311640255 in words is "one trillion, eight hundred twenty-one billion, three hundred eleven million, six hundred forty thousand, two hundred fifty-five".