8670643669 has 2 divisors, whose sum is σ = 8670643670. Its totient is φ = 8670643668.

The previous prime is 8670643649. The next prime is 8670643687. The reversal of 8670643669 is 9663460768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8658302500 + 12341169 = 93050^2 + 3513^2 .

It is a cyclic number.

It is not a de Polignac number, because 8670643669 - 2²³ = 8662255061 is a prime.

It is a super-2 number, since 2×8670643669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8670643649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4335321834 + 4335321835.

It is an arithmetic number, because the mean of its divisors is an integer number (4335321835).

Almost surely, 2^8670643669 is an apocalyptic number.

It is an amenable number.

8670643669 is a deficient number, since it is larger than the sum of its proper divisors (1).

8670643669 is an equidigital number, since it uses as much as digits as its factorization.

8670643669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The square root of 8670643669 is about 93116.2911041886. The cubic root of 8670643669 is about 2054.3941966309.

The spelling of 8670643669 in words is "eight billion, six hundred seventy million, six hundred forty-three thousand, six hundred sixty-nine".