1618344797 has 4 divisors (see below), whose sum is σ = 1674149820. Its totient is φ = 1562539776.

The previous prime is 1618344751. The next prime is 1618344821. The reversal of 1618344797 is 7974438161.

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 1113623641 + 504721156 = 33371^2 + 22466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618344797 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 (1618344997) 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 3 ways as a sum of consecutive naturals, for example, 27902468 + ... + 27902525.

It is an arithmetic number, because the mean of its divisors is an integer number (418537455).

Almost surely, 2^1618344797 is an apocalyptic number.

It is an amenable number.

1618344797 is a deficient number, since it is larger than the sum of its proper divisors (55805023).

1618344797 is an equidigital number, since it uses as much as digits as its factorization.

1618344797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55805022.

The product of its digits is 1016064, while the sum is 50.

The square root of 1618344797 is about 40228.6564155454. The cubic root of 1618344797 is about 1174.0601621765.

The spelling of 1618344797 in words is "one billion, six hundred eighteen million, three hundred forty-four thousand, seven hundred ninety-seven".