171649878792 has 128 divisors (see below), whose sum is σ = 492065245440. Its totient is φ = 48879452160.

The previous prime is 171649878791. The next prime is 171649878797. The reversal of 171649878792 is 297878946171.

It is not an unprimeable number, because it can be changed into a prime (171649878791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85100568 + ... + 85102584.

It is an arithmetic number, because the mean of its divisors is an integer number (3844259730).

Almost surely, 2^171649878792 is an apocalyptic number.

171649878792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

171649878792 is an abundant number, since it is smaller than the sum of its proper divisors (320415366648).

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

171649878792 is a wasteful number, since it uses less digits than its factorization.

171649878792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471 (or 3467 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 69.

The spelling of 171649878792 in words is "one hundred seventy-one billion, six hundred forty-nine million, eight hundred seventy-eight thousand, seven hundred ninety-two".