6666603601 has 16 divisors (see below), whose sum is σ = 8177670144. Its totient is φ = 5304420864.

The previous prime is 6666603571. The next prime is 6666603611. The reversal of 6666603601 is 1063066666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6666603601 - 2⁹ = 6666603089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6666603611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375025 + ... + 392398.

It is an arithmetic number, because the mean of its divisors is an integer number (511104384).

Almost surely, 2^6666603601 is an apocalyptic number.

It is an amenable number.

6666603601 is a deficient number, since it is larger than the sum of its proper divisors (1511066543).

6666603601 is a wasteful number, since it uses less digits than its factorization.

6666603601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767520.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 6666603601 is about 81649.2718951002. The cubic root of 6666603601 is about 1882.0661230369.

The spelling of 6666603601 in words is "six billion, six hundred sixty-six million, six hundred three thousand, six hundred one".