7000661 has 2 divisors, whose sum is σ = 7000662. Its totient is φ = 7000660.

The previous prime is 7000657. The next prime is 7000663. The reversal of 7000661 is 1660007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3648100 + 3352561 = 1910^2 + 1831^2 .

It is an emirp because it is prime and its reverse (1660007) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7000661 - 2² = 7000657 is a prime.

Together with 7000663, 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 (7000663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3500330 + 3500331.

It is an arithmetic number, because the mean of its divisors is an integer number (3500331).

Almost surely, 2^7000661 is an apocalyptic number.

It is an amenable number.

7000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7000661 is an equidigital number, since it uses as much as digits as its factorization.

7000661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 7000661 is about 2645.8762253741. The cubic root of 7000661 is about 191.2991392664.

Adding to 7000661 its reverse (1660007), we get a palindrome (8660668).

The spelling of 7000661 in words is "seven million, six hundred sixty-one", and thus it is an aban number.