618261668 has 6 divisors (see below), whose sum is σ = 1081957926. Its totient is φ = 309130832.

The previous prime is 618261667. The next prime is 618261727. The reversal of 618261668 is 866162816.

618261668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 596434084 + 21827584 = 24422^2 + 4672^2 .

It is not an unprimeable number, because it can be changed into a prime (618261667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77282705 + ... + 77282712.

It is an arithmetic number, because the mean of its divisors is an integer number (180326321).

Almost surely, 2^618261668 is an apocalyptic number.

It is an amenable number.

618261668 is a deficient number, since it is larger than the sum of its proper divisors (463696258).

618261668 is a wasteful number, since it uses less digits than its factorization.

618261668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154565421 (or 154565419 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 618261668 is about 24864.8681476496. The cubic root of 618261668 is about 851.9042281792.

The spelling of 618261668 in words is "six hundred eighteen million, two hundred sixty-one thousand, six hundred sixty-eight".