618944957 has 8 divisors (see below), whose sum is σ = 628630200. Its totient is φ = 609333760.

The previous prime is 618944951. The next prime is 618945011. The reversal of 618944957 is 759449816.

It can be written as a sum of positive squares in 4 ways, for example, as 148011556 + 470933401 = 12166^2 + 21701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618944957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 618944899 and 618944908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618944951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1544 + ... + 35217.

It is an arithmetic number, because the mean of its divisors is an integer number (78578775).

Almost surely, 2^618944957 is an apocalyptic number.

It is an amenable number.

618944957 is a deficient number, since it is larger than the sum of its proper divisors (9685243).

618944957 is a wasteful number, since it uses less digits than its factorization.

618944957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37023.

The product of its digits is 2177280, while the sum is 53.

The square root of 618944957 is about 24878.6044021766. The cubic root of 618944957 is about 852.2179478170.

The spelling of 618944957 in words is "six hundred eighteen million, nine hundred forty-four thousand, nine hundred fifty-seven".