263656191137 has 2 divisors, whose sum is σ = 263656191138. Its totient is φ = 263656191136.

The previous prime is 263656191133. The next prime is 263656191167. The reversal of 263656191137 is 731191656362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263595989056 + 60202081 = 513416^2 + 7759^2 .

It is a cyclic number.

It is not a de Polignac number, because 263656191137 - 2² = 263656191133 is a prime.

It is not a weakly prime, because it can be changed into another prime (263656191133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131828095568 + 131828095569.

It is an arithmetic number, because the mean of its divisors is an integer number (131828095569).

Almost surely, 2^263656191137 is an apocalyptic number.

It is an amenable number.

263656191137 is a deficient number, since it is larger than the sum of its proper divisors (1).

263656191137 is an equidigital number, since it uses as much as digits as its factorization.

263656191137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 50.

The spelling of 263656191137 in words is "two hundred sixty-three billion, six hundred fifty-six million, one hundred ninety-one thousand, one hundred thirty-seven".