81760758251 has 12 divisors (see below), whose sum is σ = 85181434632. Its totient is φ = 78461172288.

The previous prime is 81760758223. The next prime is 81760758337. The reversal of 81760758251 is 15285706718.

It is not a de Polignac number, because 81760758251 - 2¹⁸ = 81760496107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81760758251.

It is not an unprimeable number, because it can be changed into a prime (81760758221) 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 in 11 ways as a sum of consecutive naturals, for example, 309125 + ... + 508998.

It is an arithmetic number, because the mean of its divisors is an integer number (7098452886).

Almost surely, 2^81760758251 is an apocalyptic number.

81760758251 is a deficient number, since it is larger than the sum of its proper divisors (3420676381).

81760758251 is an equidigital number, since it uses as much as digits as its factorization.

81760758251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818270 (or 818233 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 81760758251 in words is "eighty-one billion, seven hundred sixty million, seven hundred fifty-eight thousand, two hundred fifty-one".