1820018191001 has 4 divisors (see below), whose sum is σ = 1820051387172. Its totient is φ = 1819984994832.

The previous prime is 1820018190983. The next prime is 1820018191093. The reversal of 1820018191001 is 1001918100281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1056011085376 + 764007105625 = 1027624^2 + 874075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820018191001 - 2³⁸ = 1545140284057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820018191301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16515710 + ... + 16625543.

It is an arithmetic number, because the mean of its divisors is an integer number (455012846793).

Almost surely, 2^{1820018191001} is an apocalyptic number.

It is an amenable number.

1820018191001 is a deficient number, since it is larger than the sum of its proper divisors (33196171).

1820018191001 is an equidigital number, since it uses as much as digits as its factorization.

1820018191001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33196170.

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 1820018191001 in words is "one trillion, eight hundred twenty billion, eighteen million, one hundred ninety-one thousand, one".