5656666628 has 12 divisors (see below), whose sum is σ = 10010393820. Its totient is φ = 2796554112.

The previous prime is 5656666607. The next prime is 5656666693. The reversal of 5656666628 is 8266666565.

It can be written as a sum of positive squares in 2 ways, for example, as 1383691204 + 4272975424 = 37198^2 + 65368^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7944401 + ... + 7945112.

It is an arithmetic number, because the mean of its divisors is an integer number (834199485).

Almost surely, 2^5656666628 is an apocalyptic number.

It is an amenable number.

5656666628 is a deficient number, since it is larger than the sum of its proper divisors (4353727192).

5656666628 is a wasteful number, since it uses less digits than its factorization.

5656666628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15889606 (or 15889604 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 56.

The square root of 5656666628 is about 75210.8145681191. The cubic root of 5656666628 is about 1781.7777370406. Note that the first 4 decimals are identical.

The spelling of 5656666628 in words is "five billion, six hundred fifty-six million, six hundred sixty-six thousand, six hundred twenty-eight".