618673739309 has 4 divisors (see below), whose sum is σ = 618694571100. Its totient is φ = 618652907520.

The previous prime is 618673739291. The next prime is 618673739353. The reversal of 618673739309 is 903937376816.

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 552722363209 + 65951376100 = 743453^2 + 256810^2 .

It is a cyclic number.

It is not a de Polignac number, because 618673739309 - 2²⁴ = 618656962093 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 (618673739009) 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, 10371284 + ... + 10430765.

It is an arithmetic number, because the mean of its divisors is an integer number (154673642775).

Almost surely, 2^618673739309 is an apocalyptic number.

It is an amenable number.

618673739309 is a deficient number, since it is larger than the sum of its proper divisors (20831791).

618673739309 is a wasteful number, since it uses less digits than its factorization.

618673739309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20831790.

The product of its (nonzero) digits is 30862944, while the sum is 62.

The spelling of 618673739309 in words is "six hundred eighteen billion, six hundred seventy-three million, seven hundred thirty-nine thousand, three hundred nine".