1818407325493 has 4 divisors (see below), whose sum is σ = 1983717082368. Its totient is φ = 1653097568620.

The previous prime is 1818407325463. The next prime is 1818407325499. The reversal of 1818407325493 is 3945237048181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1818407325493 - 2³⁷ = 1680968372021 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 (1818407325499) 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, 82654878421 + ... + 82654878442.

It is an arithmetic number, because the mean of its divisors is an integer number (495929270592).

Almost surely, 2^{1818407325493} is an apocalyptic number.

It is an amenable number.

1818407325493 is a deficient number, since it is larger than the sum of its proper divisors (165309756875).

1818407325493 is a wasteful number, since it uses less digits than its factorization.

1818407325493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165309756874.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 1818407325493 in words is "one trillion, eight hundred eighteen billion, four hundred seven million, three hundred twenty-five thousand, four hundred ninety-three".