263881254997 has 2 divisors, whose sum is σ = 263881254998. Its totient is φ = 263881254996.

The previous prime is 263881254913. The next prime is 263881255013. The reversal of 263881254997 is 799452188362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249834027556 + 14047227441 = 499834^2 + 118521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263881254997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263881254097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131940627498 + 131940627499.

It is an arithmetic number, because the mean of its divisors is an integer number (131940627499).

Almost surely, 2^263881254997 is an apocalyptic number.

It is an amenable number.

263881254997 is a deficient number, since it is larger than the sum of its proper divisors (1).

263881254997 is an equidigital number, since it uses as much as digits as its factorization.

263881254997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 64.

The spelling of 263881254997 in words is "two hundred sixty-three billion, eight hundred eighty-one million, two hundred fifty-four thousand, nine hundred ninety-seven".