1813122067720 has 32 divisors (see below), whose sum is σ = 4079576943000. Its totient is φ = 725239531008.

The previous prime is 1813122067711. The next prime is 1813122067721. The reversal of 1813122067720 is 277602213181.

It can be written as a sum of positive squares in 4 ways, for example, as 1627497238756 + 185624828964 = 1275734^2 + 430842^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1813122067721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3470206 + ... + 3958354.

Almost surely, 2^{1813122067720} is an apocalyptic number.

1813122067720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1813122067720 is an abundant number, since it is smaller than the sum of its proper divisors (2266454875280).

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

1813122067720 is a wasteful number, since it uses less digits than its factorization.

1813122067720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581017 (or 581013 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 1813122067720 in words is "one trillion, eight hundred thirteen billion, one hundred twenty-two million, sixty-seven thousand, seven hundred twenty".