6556665506 has 16 divisors (see below), whose sum is σ = 10176400440. Its totient is φ = 3164582400.

The previous prime is 6556665497. The next prime is 6556665539. The reversal of 6556665506 is 6055666556.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6521370025 + 35295481 = 80755^2 + 5941^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330056 + ... + 349356.

Almost surely, 2^6556665506 is an apocalyptic number.

6556665506 is a deficient number, since it is larger than the sum of its proper divisors (3619734934).

6556665506 is a wasteful number, since it uses less digits than its factorization.

6556665506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25189.

The product of its (nonzero) digits is 4860000, while the sum is 50.

The square root of 6556665506 is about 80973.2394436582. The cubic root of 6556665506 is about 1871.6630906295.

It can be divided in two parts, 655666550 and 6, that added together give a palindrome (655666556).

The spelling of 6556665506 in words is "six billion, five hundred fifty-six million, six hundred sixty-five thousand, five hundred six".