171192638719940 has 24 divisors (see below), whose sum is σ = 380651867272152. Its totient is φ = 64448993400320.

The previous prime is 171192638719939. The next prime is 171192638720029. The reversal of 171192638719940 is 49917836291171.

It can be written as a sum of positive squares in 4 ways, for example, as 36800044220416 + 134392594499524 = 6066304^2 + 11592782^2 .

It is a Harshad number since it is a multiple of its sum of digits (68).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251753880131 + ... + 251753880810.

It is an arithmetic number, because the mean of its divisors is an integer number (15860494469673).

Almost surely, 2^{171192638719940} is an apocalyptic number.

171192638719940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171192638719940 is an abundant number, since it is smaller than the sum of its proper divisors (209459228552212).

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

171192638719940 is a wasteful number, since it uses less digits than its factorization.

171192638719940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503507760967 (or 503507760965 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 68.

The spelling of 171192638719940 in words is "one hundred seventy-one trillion, one hundred ninety-two billion, six hundred thirty-eight million, seven hundred nineteen thousand, nine hundred forty".