1806621067840 has 224 divisors, whose sum is σ = 5003293950720. Its totient is φ = 616327151616.

The previous prime is 1806621067831. The next prime is 1806621067841. The reversal of 1806621067840 is 487601266081.

It is not an unprimeable number, because it can be changed into a prime (1806621067841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1997304 + ... + 2757256.

Almost surely, 2^{1806621067840} is an apocalyptic number.

1806621067840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1806621067840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2501646975360).

1806621067840 is an abundant number, since it is smaller than the sum of its proper divisors (3196672882880).

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

1806621067840 is a wasteful number, since it uses less digits than its factorization.

1806621067840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760029 (or 760019 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 1806621067840 in words is "one trillion, eight hundred six billion, six hundred twenty-one million, sixty-seven thousand, eight hundred forty".