82155939465599 has 4 divisors (see below), whose sum is σ = 82155965928120. Its totient is φ = 82155913003080.

The previous prime is 82155939465581. The next prime is 82155939465637. The reversal of 82155939465599 is 99556493955128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82155939465599 is a prime.

It is a super-3 number, since 3×82155939465599³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82155939465569) 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, 7842869 + ... + 15027390.

It is an arithmetic number, because the mean of its divisors is an integer number (20538991482030).

Almost surely, 2^{82155939465599} is an apocalyptic number.

82155939465599 is a deficient number, since it is larger than the sum of its proper divisors (26462521).

82155939465599 is a wasteful number, since it uses less digits than its factorization.

82155939465599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26462520.

The product of its digits is 4723920000, while the sum is 80.

The spelling of 82155939465599 in words is "eighty-two trillion, one hundred fifty-five billion, nine hundred thirty-nine million, four hundred sixty-five thousand, five hundred ninety-nine".