8506570661 has 4 divisors (see below), whose sum is σ = 8507337324. Its totient is φ = 8505804000.

The previous prime is 8506570607. The next prime is 8506570673. The reversal of 8506570661 is 1660756058.

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 3984008161 + 4522562500 = 63119^2 + 67250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8506570661 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 (8506570601) 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, 366440 + ... + 388961.

It is an arithmetic number, because the mean of its divisors is an integer number (2126834331).

Almost surely, 2^8506570661 is an apocalyptic number.

It is an amenable number.

8506570661 is a deficient number, since it is larger than the sum of its proper divisors (766663).

8506570661 is a wasteful number, since it uses less digits than its factorization.

8506570661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766662.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 8506570661 is about 92231.0721015429. The cubic root of 8506570661 is about 2041.3532816329.

The spelling of 8506570661 in words is "eight billion, five hundred six million, five hundred seventy thousand, six hundred sixty-one".