171640822990 has 128 divisors (see below), whose sum is σ = 384025162752. Its totient is φ = 53784207360.

The previous prime is 171640822981. The next prime is 171640822993. The reversal of 171640822990 is 99228046171.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171640822993) 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 63 ways as a sum of consecutive naturals, for example, 62345454 + ... + 62348206.

It is an arithmetic number, because the mean of its divisors is an integer number (3000196584).

Almost surely, 2^171640822990 is an apocalyptic number.

171640822990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

171640822990 is an abundant number, since it is smaller than the sum of its proper divisors (212384339762).

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

171640822990 is a wasteful number, since it uses less digits than its factorization.

171640822990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 171640822990 in words is "one hundred seventy-one billion, six hundred forty million, eight hundred twenty-two thousand, nine hundred ninety".