6661205607 has 16 divisors (see below), whose sum is σ = 10186284800. Its totient is φ = 3792949632.

The previous prime is 6661205563. The next prime is 6661205627. The reversal of 6661205607 is 7065021666.

It is a de Polignac number, because none of the positive numbers 2^k-6661205607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661205627) 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, 554482 + ... + 566367.

It is an arithmetic number, because the mean of its divisors is an integer number (636642800).

Almost surely, 2^6661205607 is an apocalyptic number.

6661205607 is a deficient number, since it is larger than the sum of its proper divisors (3525079193).

6661205607 is a wasteful number, since it uses less digits than its factorization.

6661205607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121142.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 6661205607 is about 81616.2092172872. The cubic root of 6661205607 is about 1881.5580119845.

The spelling of 6661205607 in words is "six billion, six hundred sixty-one million, two hundred five thousand, six hundred seven".