82077820658 has 4 divisors (see below), whose sum is σ = 123116730990. Its totient is φ = 41038910328.

The previous prime is 82077820651. The next prime is 82077820687. The reversal of 82077820658 is 85602877028.

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

It can be written as a sum of positive squares in only one way, i.e., 81992313649 + 85507009 = 286343^2 + 9247^2 .

It is not an unprimeable number, because it can be changed into a prime (82077820651) 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, 20519455163 + ... + 20519455166.

Almost surely, 2^82077820658 is an apocalyptic number.

82077820658 is a deficient number, since it is larger than the sum of its proper divisors (41038910332).

82077820658 is a wasteful number, since it uses less digits than its factorization.

82077820658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41038910331.

The product of its (nonzero) digits is 3010560, while the sum is 53.

The spelling of 82077820658 in words is "eighty-two billion, seventy-seven million, eight hundred twenty thousand, six hundred fifty-eight".