170650661 has 2 divisors, whose sum is σ = 170650662. Its totient is φ = 170650660.

The previous prime is 170650637. The next prime is 170650663. The reversal of 170650661 is 166056071.

170650661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156400036 + 14250625 = 12506^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 170650661 - 2²² = 166456357 is a prime.

Together with 170650663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170650663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85325330 + 85325331.

It is an arithmetic number, because the mean of its divisors is an integer number (85325331).

Almost surely, 2^170650661 is an apocalyptic number.

It is an amenable number.

170650661 is a deficient number, since it is larger than the sum of its proper divisors (1).

170650661 is an equidigital number, since it uses as much as digits as its factorization.

170650661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 170650661 is about 13063.3326911627. The cubic root of 170650661 is about 554.6716787674.

The spelling of 170650661 in words is "one hundred seventy million, six hundred fifty thousand, six hundred sixty-one".