1821868642080 has 72 divisors (see below), whose sum is σ = 6217126746012. Its totient is φ = 485831637504.

The previous prime is 1821868642079. The next prime is 1821868642159. The reversal of 1821868642080 is 802468681281.

1821868642080 is a `hidden beast` number, since 1 + 82 + 1 + 8 + 68 + 6 + 420 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1776238555536 + 45630086544 = 1332756^2 + 213612^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 632591839 + ... + 632594718.

Almost surely, 2^{1821868642080} is an apocalyptic number.

1821868642080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821868642080 is an abundant number, since it is smaller than the sum of its proper divisors (4395258103932).

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

1821868642080 is a wasteful number, since it uses less digits than its factorization.

1821868642080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265186578 (or 1265186567 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 54.

The spelling of 1821868642080 in words is "one trillion, eight hundred twenty-one billion, eight hundred sixty-eight million, six hundred forty-two thousand, eighty".