82420387457 has 4 divisors (see below), whose sum is σ = 82559376900. Its totient is φ = 82281398016.

The previous prime is 82420387447. The next prime is 82420387459. The reversal of 82420387457 is 75478302428.

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 35919346576 + 46501040881 = 189524^2 + 215641^2 .

It is a cyclic number.

It is not a de Polignac number, because 82420387457 - 2⁸ = 82420387201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82420387459) 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, 69493832 + ... + 69495017.

It is an arithmetic number, because the mean of its divisors is an integer number (20639844225).

Almost surely, 2^82420387457 is an apocalyptic number.

It is an amenable number.

82420387457 is a deficient number, since it is larger than the sum of its proper divisors (138989443).

82420387457 is a wasteful number, since it uses less digits than its factorization.

82420387457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138989442.

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 82420387457 in words is "eighty-two billion, four hundred twenty million, three hundred eighty-seven thousand, four hundred fifty-seven".