81252758263 has 2 divisors, whose sum is σ = 81252758264. Its totient is φ = 81252758262.

The previous prime is 81252758243. The next prime is 81252758267. The reversal of 81252758263 is 36285725218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81252758263 - 2³³ = 72662823671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81252758267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40626379131 + 40626379132.

It is an arithmetic number, because the mean of its divisors is an integer number (40626379132).

Almost surely, 2^81252758263 is an apocalyptic number.

81252758263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81252758263 is an equidigital number, since it uses as much as digits as its factorization.

81252758263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 49.

The spelling of 81252758263 in words is "eighty-one billion, two hundred fifty-two million, seven hundred fifty-eight thousand, two hundred sixty-three".