82945385405 has 4 divisors (see below), whose sum is σ = 99534462492. Its totient is φ = 66356308320.

The previous prime is 82945385399. The next prime is 82945385407. The reversal of 82945385405 is 50458354928.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52010907481 + 30934477924 = 228059^2 + 175882^2 .

It is not a de Polignac number, because 82945385405 - 2²⁶ = 82878276541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82945385407) 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, 8294538536 + ... + 8294538545.

It is an arithmetic number, because the mean of its divisors is an integer number (24883615623).

Almost surely, 2^82945385405 is an apocalyptic number.

It is an amenable number.

82945385405 is a deficient number, since it is larger than the sum of its proper divisors (16589077087).

82945385405 is a wasteful number, since it uses less digits than its factorization.

82945385405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16589077086.

The product of its (nonzero) digits is 6912000, while the sum is 53.

The spelling of 82945385405 in words is "eighty-two billion, nine hundred forty-five million, three hundred eighty-five thousand, four hundred five".