618668623 has 2 divisors, whose sum is σ = 618668624. Its totient is φ = 618668622.

The previous prime is 618668599. The next prime is 618668657. The reversal of 618668623 is 326866816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618668623 - 2¹³ = 618660431 is a prime.

It is a super-2 number, since 2×618668623² = 765501730169432258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618668663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309334311 + 309334312.

It is an arithmetic number, because the mean of its divisors is an integer number (309334312).

Almost surely, 2^618668623 is an apocalyptic number.

618668623 is a deficient number, since it is larger than the sum of its proper divisors (1).

618668623 is an equidigital number, since it uses as much as digits as its factorization.

618668623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 618668623 is about 24873.0501346337. The cubic root of 618668623 is about 852.0911019389.

The spelling of 618668623 in words is "six hundred eighteen million, six hundred sixty-eight thousand, six hundred twenty-three".