82640211867658 has 4 divisors (see below), whose sum is σ = 123960317801490. Its totient is φ = 41320105933828.

The previous prime is 82640211867617. The next prime is 82640211867673. The reversal of 82640211867658 is 85676811204628.

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., 82588781338569 + 51430529089 = 9087837^2 + 226783^2 .

It is a super-3 number, since 3×82640211867658³ (a number of 43 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82640211867658.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20660052966913 + ... + 20660052966916.

Almost surely, 2^{82640211867658} is an apocalyptic number.

82640211867658 is a deficient number, since it is larger than the sum of its proper divisors (41320105933832).

82640211867658 is a wasteful number, since it uses less digits than its factorization.

82640211867658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41320105933831.

The product of its (nonzero) digits is 61931520, while the sum is 64.

The spelling of 82640211867658 in words is "eighty-two trillion, six hundred forty billion, two hundred eleven million, eight hundred sixty-seven thousand, six hundred fifty-eight".