830666561 has 4 divisors (see below), whose sum is σ = 849984432. Its totient is φ = 811348692.

The previous prime is 830666537. The next prime is 830666587. The reversal of 830666561 is 165666038.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 830666561 - 2⁶ = 830666497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (830666531) 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, 9658871 + ... + 9658956.

It is an arithmetic number, because the mean of its divisors is an integer number (212496108).

Almost surely, 2^830666561 is an apocalyptic number.

It is an amenable number.

830666561 is a deficient number, since it is larger than the sum of its proper divisors (19317871).

830666561 is a wasteful number, since it uses less digits than its factorization.

830666561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19317870.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 830666561 is about 28821.2865951539. The cubic root of 830666561 is about 940.0311446600.

The spelling of 830666561 in words is "eight hundred thirty million, six hundred sixty-six thousand, five hundred sixty-one".