16570661 has 2 divisors, whose sum is σ = 16570662. Its totient is φ = 16570660.

The previous prime is 16570651. The next prime is 16570663. The reversal of 16570661 is 16607561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 3682561 = 3590^2 + 1919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16570661 is a prime.

Together with 16570663, 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 (16570663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8285330 + 8285331.

It is an arithmetic number, because the mean of its divisors is an integer number (8285331).

Almost surely, 2^16570661 is an apocalyptic number.

It is an amenable number.

16570661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16570661 is an equidigital number, since it uses as much as digits as its factorization.

16570661 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 16570661 is about 4070.7076780334. The cubic root of 16570661 is about 254.9450657007.

The spelling of 16570661 in words is "sixteen million, five hundred seventy thousand, six hundred sixty-one".