867925661 has 2 divisors, whose sum is σ = 867925662. Its totient is φ = 867925660.

The previous prime is 867925649. The next prime is 867925703. The reversal of 867925661 is 166529768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 835788100 + 32137561 = 28910^2 + 5669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-867925661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (867925561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433962830 + 433962831.

It is an arithmetic number, because the mean of its divisors is an integer number (433962831).

Almost surely, 2^867925661 is an apocalyptic number.

It is an amenable number.

867925661 is a deficient number, since it is larger than the sum of its proper divisors (1).

867925661 is an equidigital number, since it uses as much as digits as its factorization.

867925661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 867925661 is about 29460.5780832624. The cubic root of 867925661 is about 953.8809516003.

The spelling of 867925661 in words is "eight hundred sixty-seven million, nine hundred twenty-five thousand, six hundred sixty-one".