6661070561 has 4 divisors (see below), whose sum is σ = 6709691652. Its totient is φ = 6612449472.

The previous prime is 6661070527. The next prime is 6661070573. The reversal of 6661070561 is 1650701666.

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 1299169936 + 5361900625 = 36044^2 + 73225^2 .

It is a cyclic number.

It is not a de Polignac number, because 6661070561 - 2³⁰ = 5587328737 is a prime.

It is a super-2 number, since 2×6661070561² = 88739722037241709442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661000561) 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, 24310340 + ... + 24310613.

It is an arithmetic number, because the mean of its divisors is an integer number (1677422913).

Almost surely, 2^6661070561 is an apocalyptic number.

It is an amenable number.

6661070561 is a deficient number, since it is larger than the sum of its proper divisors (48621091).

6661070561 is a wasteful number, since it uses less digits than its factorization.

6661070561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48621090.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 6661070561 is about 81615.3818896904. The cubic root of 6661070561 is about 1881.5452966386.

The spelling of 6661070561 in words is "six billion, six hundred sixty-one million, seventy thousand, five hundred sixty-one".