656963109391 has 2 divisors, whose sum is σ = 656963109392. Its totient is φ = 656963109390.

The previous prime is 656963109343. The next prime is 656963109401. The reversal of 656963109391 is 193901369656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656963109391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656963106391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328481554695 + 328481554696.

It is an arithmetic number, because the mean of its divisors is an integer number (328481554696).

Almost surely, 2^656963109391 is an apocalyptic number.

656963109391 is a deficient number, since it is larger than the sum of its proper divisors (1).

656963109391 is an equidigital number, since it uses as much as digits as its factorization.

656963109391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7085880, while the sum is 58.

The spelling of 656963109391 in words is "six hundred fifty-six billion, nine hundred sixty-three million, one hundred nine thousand, three hundred ninety-one".