171542579678 has 16 divisors (see below), whose sum is σ = 263607855840. Its totient is φ = 83673580800.

The previous prime is 171542579651. The next prime is 171542579729. The reversal of 171542579678 is 876975245171.

It is a self number, because there is not a number n which added to its sum of digits gives 171542579678.

It is a congruent number.

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, 1291238 + ... + 1417878.

It is an arithmetic number, because the mean of its divisors is an integer number (16475490990).

Almost surely, 2^171542579678 is an apocalyptic number.

171542579678 is a deficient number, since it is larger than the sum of its proper divisors (92065276162).

171542579678 is a wasteful number, since it uses less digits than its factorization.

171542579678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143203.

The product of its digits is 29635200, while the sum is 62.

The spelling of 171542579678 in words is "one hundred seventy-one billion, five hundred forty-two million, five hundred seventy-nine thousand, six hundred seventy-eight".