81754766879 has 2 divisors, whose sum is σ = 81754766880. Its totient is φ = 81754766878.

The previous prime is 81754766831. The next prime is 81754766917. The reversal of 81754766879 is 97866745718.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81754766879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81754766279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40877383439 + 40877383440.

It is an arithmetic number, because the mean of its divisors is an integer number (40877383440).

Almost surely, 2^81754766879 is an apocalyptic number.

81754766879 is a deficient number, since it is larger than the sum of its proper divisors (1).

81754766879 is an equidigital number, since it uses as much as digits as its factorization.

81754766879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142248960, while the sum is 68.

The spelling of 81754766879 in words is "eighty-one billion, seven hundred fifty-four million, seven hundred sixty-six thousand, eight hundred seventy-nine".