81702557929 has 2 divisors, whose sum is σ = 81702557930. Its totient is φ = 81702557928.

The previous prime is 81702557897. The next prime is 81702557953. The reversal of 81702557929 is 92975520718.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78671835225 + 3030722704 = 280485^2 + 55052^2 .

It is a cyclic number.

It is not a de Polignac number, because 81702557929 - 2⁵ = 81702557897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81702557929.

It is not a weakly prime, because it can be changed into another prime (81702557999) 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, 40851278964 + 40851278965.

It is an arithmetic number, because the mean of its divisors is an integer number (40851278965).

Almost surely, 2^81702557929 is an apocalyptic number.

It is an amenable number.

81702557929 is a deficient number, since it is larger than the sum of its proper divisors (1).

81702557929 is an equidigital number, since it uses as much as digits as its factorization.

81702557929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 81702557929 in words is "eighty-one billion, seven hundred two million, five hundred fifty-seven thousand, nine hundred twenty-nine".