5120665636 has 12 divisors (see below), whose sum is σ = 8962091740. Its totient is φ = 2560068000.

The previous prime is 5120665609. The next prime is 5120665717. The reversal of 5120665636 is 6365660215.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2000772900 + 3119892736 = 44730^2 + 55856^2 .

It is a super-2 number, since 2×5120665636² = 52442433111422568992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18951 + ... + 102958.

Almost surely, 2^5120665636 is an apocalyptic number.

It is an amenable number.

5120665636 is a deficient number, since it is larger than the sum of its proper divisors (3841426104).

5120665636 is a wasteful number, since it uses less digits than its factorization.

5120665636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132414 (or 132412 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 5120665636 is about 71558.8264017794. The cubic root of 5120665636 is about 1723.6224398978.

The spelling of 5120665636 in words is "five billion, one hundred twenty million, six hundred sixty-five thousand, six hundred thirty-six".