1812766021081 has 8 divisors (see below), whose sum is σ = 1813634573760. Its totient is φ = 1811897684688.

The previous prime is 1812766021063. The next prime is 1812766021151. The reversal of 1812766021081 is 1801206672181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1812766021081 - 2⁵ = 1812766021049 is a prime.

It is a super-2 number, since 2×1812766021081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812766021051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18149380 + ... + 18248986.

It is an arithmetic number, because the mean of its divisors is an integer number (226704321720).

Almost surely, 2^{1812766021081} is an apocalyptic number.

It is an amenable number.

1812766021081 is a deficient number, since it is larger than the sum of its proper divisors (868552679).

1812766021081 is an equidigital number, since it uses as much as digits as its factorization.

1812766021081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108143.

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 1812766021081 in words is "one trillion, eight hundred twelve billion, seven hundred sixty-six million, twenty-one thousand, eighty-one".