385986661 has 2 divisors, whose sum is σ = 385986662. Its totient is φ = 385986660.

The previous prime is 385986659. The next prime is 385986703. The reversal of 385986661 is 166689583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328696900 + 57289761 = 18130^2 + 7569^2 .

It is an emirp because it is prime and its reverse (166689583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385986661 - 2¹ = 385986659 is a prime.

Together with 385986659, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 385986599 and 385986608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385986761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192993330 + 192993331.

It is an arithmetic number, because the mean of its divisors is an integer number (192993331).

Almost surely, 2^385986661 is an apocalyptic number.

It is an amenable number.

385986661 is a deficient number, since it is larger than the sum of its proper divisors (1).

385986661 is an equidigital number, since it uses as much as digits as its factorization.

385986661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The square root of 385986661 is about 19646.5432328438. The cubic root of 385986661 is about 728.0995547998.

The spelling of 385986661 in words is "three hundred eighty-five million, nine hundred eighty-six thousand, six hundred sixty-one".