82173209718 has 16 divisors (see below), whose sum is σ = 165197957616. Its totient is φ = 27249146880.

The previous prime is 82173209717. The next prime is 82173209719. The reversal of 82173209718 is 81790237128.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (82173209717) and next prime (82173209719).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82173209717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35479503 + ... + 35481818.

It is an arithmetic number, because the mean of its divisors is an integer number (10324872351).

Almost surely, 2^82173209718 is an apocalyptic number.

82173209718 is an abundant number, since it is smaller than the sum of its proper divisors (83024747898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82173209718 is a wasteful number, since it uses less digits than its factorization.

82173209718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70961519.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 82173209718 in words is "eighty-two billion, one hundred seventy-three million, two hundred nine thousand, seven hundred eighteen".