618609663 has 48 divisors (see below), whose sum is σ = 1074180960. Its totient is φ = 350808192.

The previous prime is 618609659. The next prime is 618609671. The reversal of 618609663 is 366906816.

It is not a de Polignac number, because 618609663 - 2² = 618609659 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618607663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179545 + ... + 182957.

It is an arithmetic number, because the mean of its divisors is an integer number (22378770).

Almost surely, 2^618609663 is an apocalyptic number.

618609663 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

618609663 is a deficient number, since it is larger than the sum of its proper divisors (455571297).

618609663 is a wasteful number, since it uses less digits than its factorization.

618609663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573 (or 3560 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 618609663 is about 24871.8648878607. The cubic root of 618609663 is about 852.0640325808.

The spelling of 618609663 in words is "six hundred eighteen million, six hundred nine thousand, six hundred sixty-three".