82781565058077 has 4 divisors (see below), whose sum is σ = 110375420077440. Its totient is φ = 55187710038716.

The previous prime is 82781565058069. The next prime is 82781565058109. The reversal of 82781565058077 is 77085056518728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82781565058077 - 2³ = 82781565058069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82781565058007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13796927509677 + ... + 13796927509682.

It is an arithmetic number, because the mean of its divisors is an integer number (27593855019360).

Almost surely, 2^{82781565058077} is an apocalyptic number.

It is an amenable number.

82781565058077 is a deficient number, since it is larger than the sum of its proper divisors (27593855019363).

82781565058077 is a wasteful number, since it uses less digits than its factorization.

82781565058077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27593855019362.

The product of its (nonzero) digits is 263424000, while the sum is 69.

The spelling of 82781565058077 in words is "eighty-two trillion, seven hundred eighty-one billion, five hundred sixty-five million, fifty-eight thousand, seventy-seven".