6658997 has 2 divisors, whose sum is σ = 6658998. Its totient is φ = 6658996.

The previous prime is 6658969. The next prime is 6658999. The reversal of 6658997 is 7998566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5564881 + 1094116 = 2359^2 + 1046^2 .

It is a cyclic number.

It is not a de Polignac number, because 6658997 - 2¹⁴ = 6642613 is a prime.

Together with 6658999, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6658999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3329498 + 3329499.

It is an arithmetic number, because the mean of its divisors is an integer number (3329499).

Almost surely, 2^6658997 is an apocalyptic number.

It is an amenable number.

6658997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6658997 is an equidigital number, since it uses as much as digits as its factorization.

6658997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The square root of 6658997 is about 2580.5032454930. The cubic root of 6658997 is about 188.1350037542.

The spelling of 6658997 in words is "six million, six hundred fifty-eight thousand, nine hundred ninety-seven".