82781720570077 has 8 divisors (see below), whose sum is σ = 87139105668000. Its totient is φ = 78424380715824.

The previous prime is 82781720570051. The next prime is 82781720570083. The reversal of 82781720570077 is 77007502718728.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82781720570077 - 2⁷ = 82781720569949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82781720569997 and 82781720570024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82781720570677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7522702 + ... + 14904847.

It is an arithmetic number, because the mean of its divisors is an integer number (10892388208500).

Almost surely, 2^{82781720570077} is an apocalyptic number.

It is an amenable number.

82781720570077 is a deficient number, since it is larger than the sum of its proper divisors (4357385097923).

82781720570077 is a wasteful number, since it uses less digits than its factorization.

82781720570077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22621835.

The product of its (nonzero) digits is 21512960, while the sum is 61.

The spelling of 82781720570077 in words is "eighty-two trillion, seven hundred eighty-one billion, seven hundred twenty million, five hundred seventy thousand, seventy-seven".