6690569 has 2 divisors, whose sum is σ = 6690570. Its totient is φ = 6690568.

The previous prime is 6690559. The next prime is 6690577. The reversal of 6690569 is 9650966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5664400 + 1026169 = 2380^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 6690569 - 2¹⁶ = 6625033 is a prime.

It is a super-2 number, since 2×6690569² = 89527427087522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6690559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345284 + 3345285.

It is an arithmetic number, because the mean of its divisors is an integer number (3345285).

Almost surely, 2^6690569 is an apocalyptic number.

It is an amenable number.

6690569 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690569 is an equidigital number, since it uses as much as digits as its factorization.

6690569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 6690569 is about 2586.6134229915. The cubic root of 6690569 is about 188.4318670617.

It can be divided in two parts, 6 and 690569, that multiplied together give a palindrome (4143414).

The spelling of 6690569 in words is "six million, six hundred ninety thousand, five hundred sixty-nine".