6690239357 has 2 divisors, whose sum is σ = 6690239358. Its totient is φ = 6690239356.

The previous prime is 6690239317. The next prime is 6690239377. The reversal of 6690239357 is 7539320966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4259650756 + 2430588601 = 65266^2 + 49301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6690239357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6690239317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345119678 + 3345119679.

It is an arithmetic number, because the mean of its divisors is an integer number (3345119679).

Almost surely, 2^6690239357 is an apocalyptic number.

It is an amenable number.

6690239357 is a deficient number, since it is larger than the sum of its proper divisors (1).

6690239357 is an equidigital number, since it uses as much as digits as its factorization.

6690239357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 50.

The square root of 6690239357 is about 81793.8833715578. The cubic root of 6690239357 is about 1884.2877234405.

The spelling of 6690239357 in words is "six billion, six hundred ninety million, two hundred thirty-nine thousand, three hundred fifty-seven".