81611753263 has 2 divisors, whose sum is σ = 81611753264. Its totient is φ = 81611753262.

The previous prime is 81611753233. The next prime is 81611753291. The reversal of 81611753263 is 36235711618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81611753263 - 2²¹ = 81609656111 is a prime.

It is a super-2 number, since 2×81611753263² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81611753213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40805876631 + 40805876632.

It is an arithmetic number, because the mean of its divisors is an integer number (40805876632).

Almost surely, 2^81611753263 is an apocalyptic number.

81611753263 is a deficient number, since it is larger than the sum of its proper divisors (1).

81611753263 is an equidigital number, since it uses as much as digits as its factorization.

81611753263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The spelling of 81611753263 in words is "eighty-one billion, six hundred eleven million, seven hundred fifty-three thousand, two hundred sixty-three".