82640438405251 has 4 divisors (see below), whose sum is σ = 82986214298400. Its totient is φ = 82294662512104.

The previous prime is 82640438405237. The next prime is 82640438405281. The reversal of 82640438405251 is 15250483404628.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 82640438405251 - 2¹³ = 82640438397059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82640438405221) 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, 172887946216 + ... + 172887946693.

It is an arithmetic number, because the mean of its divisors is an integer number (20746553574600).

Almost surely, 2^{82640438405251} is an apocalyptic number.

82640438405251 is a deficient number, since it is larger than the sum of its proper divisors (345775893149).

82640438405251 is a wasteful number, since it uses less digits than its factorization.

82640438405251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345775893148.

The product of its (nonzero) digits is 7372800, while the sum is 52.

The spelling of 82640438405251 in words is "eighty-two trillion, six hundred forty billion, four hundred thirty-eight million, four hundred five thousand, two hundred fifty-one".