1810121389680 has 160 divisors (see below), whose sum is σ = 5662865767680. Its totient is φ = 478272614400.

The previous prime is 1810121389669. The next prime is 1810121389697. The reversal of 1810121389680 is 869831210181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101392755 + ... + 101410605.

It is an arithmetic number, because the mean of its divisors is an integer number (35392911048).

Almost surely, 2^{1810121389680} is an apocalyptic number.

1810121389680 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 1810121389680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831432883840).

1810121389680 is an abundant number, since it is smaller than the sum of its proper divisors (3852744378000).

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

1810121389680 is a wasteful number, since it uses less digits than its factorization.

1810121389680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21719 (or 21713 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The spelling of 1810121389680 in words is "one trillion, eight hundred ten billion, one hundred twenty-one million, three hundred eighty-nine thousand, six hundred eighty".