656546789 has 2 divisors, whose sum is σ = 656546790. Its totient is φ = 656546788.

The previous prime is 656546773. The next prime is 656546791. The reversal of 656546789 is 987645656.

It is a happy number.

656546789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650505025 + 6041764 = 25505^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 656546789 - 2⁴ = 656546773 is a prime.

It is a super-2 number, since 2×656546789² = 862107372292421042, which contains 22 as substring.

Together with 656546791, 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 (656546719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328273394 + 328273395.

It is an arithmetic number, because the mean of its divisors is an integer number (328273395).

Almost surely, 2^656546789 is an apocalyptic number.

It is an amenable number.

656546789 is a deficient number, since it is larger than the sum of its proper divisors (1).

656546789 is an equidigital number, since it uses as much as digits as its factorization.

656546789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 56.

The square root of 656546789 is about 25623.1689882419. The cubic root of 656546789 is about 869.1376442045.

The spelling of 656546789 in words is "six hundred fifty-six million, five hundred forty-six thousand, seven hundred eighty-nine".