1818036241237 has 4 divisors (see below), whose sum is σ = 1819013156716. Its totient is φ = 1817059325760.

The previous prime is 1818036241193. The next prime is 1818036241247. The reversal of 1818036241237 is 7321426308181.

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 595627389361 + 1222408851876 = 771769^2 + 1105626^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818036241237 - 2³¹ = 1815888757589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818036241247) 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, 488454948 + ... + 488458669.

It is an arithmetic number, because the mean of its divisors is an integer number (454753289179).

Almost surely, 2^{1818036241237} is an apocalyptic number.

It is an amenable number.

1818036241237 is a deficient number, since it is larger than the sum of its proper divisors (976915479).

1818036241237 is an equidigital number, since it uses as much as digits as its factorization.

1818036241237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976915478.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 1818036241237 in words is "one trillion, eight hundred eighteen billion, thirty-six million, two hundred forty-one thousand, two hundred thirty-seven".