82390813445 has 4 divisors (see below), whose sum is σ = 98868976140. Its totient is φ = 65912650752.

The previous prime is 82390813441. The next prime is 82390813451. The reversal of 82390813445 is 54431809328.

It is a Cunningham number, because it is equal to 287038²+1.

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 29660417284 + 52730396161 = 172222^2 + 229631^2 .

It is a cyclic number.

It is not a de Polignac number, because 82390813445 - 2² = 82390813441 is a prime.

It is a super-2 number, since 2×82390813445² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82390813445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82390813441) 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, 8239081340 + ... + 8239081349.

It is an arithmetic number, because the mean of its divisors is an integer number (24717244035).

Almost surely, 2^82390813445 is an apocalyptic number.

It is an amenable number.

82390813445 is a deficient number, since it is larger than the sum of its proper divisors (16478162695).

82390813445 is a wasteful number, since it uses less digits than its factorization.

82390813445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16478162694.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 82390813445 in words is "eighty-two billion, three hundred ninety million, eight hundred thirteen thousand, four hundred forty-five".