1816725418873 has 4 divisors (see below), whose sum is σ = 1820940559488. Its totient is φ = 1812510278260.

The previous prime is 1816725418843. The next prime is 1816725418903. The reversal of 1816725418873 is 3788145276181.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (1816725418843) and next prime (1816725418903).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1816725418873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816725418843) 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, 2107569661 + ... + 2107570522.

It is an arithmetic number, because the mean of its divisors is an integer number (455235139872).

Almost surely, 2^{1816725418873} is an apocalyptic number.

It is an amenable number.

1816725418873 is a deficient number, since it is larger than the sum of its proper divisors (4215140615).

1816725418873 is an equidigital number, since it uses as much as digits as its factorization.

1816725418873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215140614.

The product of its digits is 18063360, while the sum is 61.

The spelling of 1816725418873 in words is "one trillion, eight hundred sixteen billion, seven hundred twenty-five million, four hundred eighteen thousand, eight hundred seventy-three".