834685661 has 2 divisors, whose sum is σ = 834685662. Its totient is φ = 834685660.

The previous prime is 834685619. The next prime is 834685681. The reversal of 834685661 is 166586438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 755920036 + 78765625 = 27494^2 + 8875^2 .

It is a cyclic number.

It is not a de Polignac number, because 834685661 - 2⁶ = 834685597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (834685681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417342830 + 417342831.

It is an arithmetic number, because the mean of its divisors is an integer number (417342831).

Almost surely, 2^834685661 is an apocalyptic number.

It is an amenable number.

834685661 is a deficient number, since it is larger than the sum of its proper divisors (1).

834685661 is an equidigital number, since it uses as much as digits as its factorization.

834685661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 47.

The square root of 834685661 is about 28890.9269667832. The cubic root of 834685661 is about 941.5447893987.

The spelling of 834685661 in words is "eight hundred thirty-four million, six hundred eighty-five thousand, six hundred sixty-one".