81790780763 has 2 divisors, whose sum is σ = 81790780764. Its totient is φ = 81790780762.

The previous prime is 81790780733. The next prime is 81790780801. The reversal of 81790780763 is 36708709718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81790780763 - 2⁸ = 81790780507 is a prime.

It is a super-2 number, since 2×81790780763² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81790780699 and 81790780708.

It is not a weakly prime, because it can be changed into another prime (81790780733) 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, 40895390381 + 40895390382.

It is an arithmetic number, because the mean of its divisors is an integer number (40895390382).

Almost surely, 2^81790780763 is an apocalyptic number.

81790780763 is a deficient number, since it is larger than the sum of its proper divisors (1).

81790780763 is an equidigital number, since it uses as much as digits as its factorization.

81790780763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 81790780763 in words is "eighty-one billion, seven hundred ninety million, seven hundred eighty thousand, seven hundred sixty-three".