6600600661 has 4 divisors (see below), whose sum is σ = 6600869452. Its totient is φ = 6600331872.

The previous prime is 6600600641. The next prime is 6600600689. The reversal of 6600600661 is 1660060066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5738062500 + 862538161 = 75750^2 + 29369^2 .

It is a cyclic number.

It is not a de Polignac number, because 6600600661 - 2²⁷ = 6466382933 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 (6600600641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93390 + ... + 148063.

It is an arithmetic number, because the mean of its divisors is an integer number (1650217363).

Almost surely, 2^6600600661 is an apocalyptic number.

It is an amenable number.

6600600661 is a deficient number, since it is larger than the sum of its proper divisors (268791).

6600600661 is a wasteful number, since it uses less digits than its factorization.

6600600661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268790.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 6600600661 is about 81244.0807751556. The cubic root of 6600600661 is about 1875.8343580024.

The spelling of 6600600661 in words is "six billion, six hundred million, six hundred thousand, six hundred sixty-one".