618647899 has 4 divisors (see below), whose sum is σ = 618710680. Its totient is φ = 618585120.

The previous prime is 618647857. The next prime is 618647903. The reversal of 618647899 is 998746816.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 618647899 - 2¹¹ = 618645851 is a prime.

It is a super-2 number, since 2×618647899² = 765450445874228402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618647819) 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, 13029 + ... + 37510.

It is an arithmetic number, because the mean of its divisors is an integer number (154677670).

Almost surely, 2^618647899 is an apocalyptic number.

618647899 is a deficient number, since it is larger than the sum of its proper divisors (62781).

618647899 is a wasteful number, since it uses less digits than its factorization.

618647899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62780.

The product of its digits is 5225472, while the sum is 58.

The square root of 618647899 is about 24872.6335356753. The cubic root of 618647899 is about 852.0815874576.

The spelling of 618647899 in words is "six hundred eighteen million, six hundred forty-seven thousand, eight hundred ninety-nine".