1820455693656 has 72 divisors (see below), whose sum is σ = 4713983015820. Its totient is φ = 585832093952.

The previous prime is 1820455693649. The next prime is 1820455693657. The reversal of 1820455693656 is 6563965540281.

It is a self number, because there is not a number n which added to its sum of digits gives 1820455693656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820455693657) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 191682700 + ... + 191692196.

Almost surely, 2^{1820455693656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820455693656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2356991507910).

1820455693656 is an abundant number, since it is smaller than the sum of its proper divisors (2893527322164).

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

1820455693656 is an frugal number, since it uses more digits than its factorization.

1820455693656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19061 (or 9531 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 60.

The spelling of 1820455693656 in words is "one trillion, eight hundred twenty billion, four hundred fifty-five million, six hundred ninety-three thousand, six hundred fifty-six".