6628565057 has 8 divisors (see below), whose sum is σ = 6711442920. Its totient is φ = 6546025600.

The previous prime is 6628564973. The next prime is 6628565087. The reversal of 6628565057 is 7505658266.

It is a Cunningham number, because it is equal to 81416²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1564677136 + 5063887921 = 39556^2 + 71161^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6628565057 - 2¹⁴ = 6628548673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6628564996 and 6628565014.

It is not an unprimeable number, because it can be changed into a prime (6628565087) 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, 45068 + ... + 123645.

It is an arithmetic number, because the mean of its divisors is an integer number (838930365).

Almost surely, 2^6628565057 is an apocalyptic number.

It is an amenable number.

6628565057 is a deficient number, since it is larger than the sum of its proper divisors (82877863).

6628565057 is a wasteful number, since it uses less digits than its factorization.

6628565057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169203.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The square root of 6628565057 is about 81416.0000061413. Note that the first 5 decimals coincide. The cubic root of 6628565057 is about 1878.4797065816.

The spelling of 6628565057 in words is "six billion, six hundred twenty-eight million, five hundred sixty-five thousand, fifty-seven".