1818121576770 has 96 divisors (see below), whose sum is σ = 4782077380080. Its totient is φ = 479208407040.

The previous prime is 1818121576769. The next prime is 1818121576841. The reversal of 1818121576770 is 776751218181.

It can be written as a sum of positive squares in 8 ways, for example, as 248982038361 + 1569139538409 = 498981^2 + 1252653^2 .

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 6577960 + ... + 6848780.

Almost surely, 2^{1818121576770} is an apocalyptic number.

1818121576770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818121576770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2391038690040).

1818121576770 is an abundant number, since it is smaller than the sum of its proper divisors (2963955803310).

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

1818121576770 is a wasteful number, since it uses less digits than its factorization.

1818121576770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271700 (or 271697 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 54.

The spelling of 1818121576770 in words is "one trillion, eight hundred eighteen billion, one hundred twenty-one million, five hundred seventy-six thousand, seven hundred seventy".