8150568661 has 2 divisors, whose sum is σ = 8150568662. Its totient is φ = 8150568660.

The previous prime is 8150568659. The next prime is 8150568721. The reversal of 8150568661 is 1668650518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4199817636 + 3950751025 = 64806^2 + 62855^2 .

It is a cyclic number.

It is not a de Polignac number, because 8150568661 - 2¹ = 8150568659 is a prime.

Together with 8150568659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8150568061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4075284330 + 4075284331.

It is an arithmetic number, because the mean of its divisors is an integer number (4075284331).

Almost surely, 2^8150568661 is an apocalyptic number.

It is an amenable number.

8150568661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8150568661 is an equidigital number, since it uses as much as digits as its factorization.

8150568661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 8150568661 is about 90280.4998933878. The cubic root of 8150568661 is about 2012.4694828442.

The spelling of 8150568661 in words is "eight billion, one hundred fifty million, five hundred sixty-eight thousand, six hundred sixty-one".