82781560863773 has 4 divisors (see below), whose sum is σ = 82783815238908. Its totient is φ = 82779306488640.

The previous prime is 82781560863767. The next prime is 82781560863779. The reversal of 82781560863773 is 37736806518728.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (82781560863767) and next prime (82781560863779).

It can be written as a sum of positive squares in 2 ways, for example, as 11498358791929 + 71283202071844 = 3390923^2 + 8442938^2 .

It is a cyclic number.

It is not a de Polignac number, because 82781560863773 - 2⁶ = 82781560863709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82781560863697 and 82781560863706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82781560863779) 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 3 ways as a sum of consecutive naturals, for example, 1127132486 + ... + 1127205927.

It is an arithmetic number, because the mean of its divisors is an integer number (20695953809727).

Almost surely, 2^{82781560863773} is an apocalyptic number.

It is an amenable number.

82781560863773 is a deficient number, since it is larger than the sum of its proper divisors (2254375135).

82781560863773 is a wasteful number, since it uses less digits than its factorization.

82781560863773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254375134.

The product of its (nonzero) digits is 568995840, while the sum is 71.

The spelling of 82781560863773 in words is "eighty-two trillion, seven hundred eighty-one billion, five hundred sixty million, eight hundred sixty-three thousand, seven hundred seventy-three".