6890000657 has 2 divisors, whose sum is σ = 6890000658. Its totient is φ = 6890000656.

The previous prime is 6890000653. The next prime is 6890000659. The reversal of 6890000657 is 7560000986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3839537296 + 3050463361 = 61964^2 + 55231^2 .

It is a cyclic number.

It is not a de Polignac number, because 6890000657 - 2² = 6890000653 is a prime.

Together with 6890000659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6890000651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445000328 + 3445000329.

It is an arithmetic number, because the mean of its divisors is an integer number (3445000329).

Almost surely, 2^6890000657 is an apocalyptic number.

It is an amenable number.

6890000657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6890000657 is an equidigital number, since it uses as much as digits as its factorization.

6890000657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 6890000657 is about 83006.0278353325. The cubic root of 6890000657 is about 1902.8581781451.

The spelling of 6890000657 in words is "six billion, eight hundred ninety million, six hundred fifty-seven", and thus it is an aban number.