171420845477878 has 8 divisors (see below), whose sum is σ = 257162660167680. Its totient is φ = 85699958755320.

The previous prime is 171420845477863. The next prime is 171420845477879. The reversal of 171420845477878 is 878774548024171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 171420845477878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171420845477879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5231971333 + ... + 5232004096.

It is an arithmetic number, because the mean of its divisors is an integer number (32145332520960).

Almost surely, 2^{171420845477878} is an apocalyptic number.

171420845477878 is a deficient number, since it is larger than the sum of its proper divisors (85741814689802).

171420845477878 is a wasteful number, since it uses less digits than its factorization.

171420845477878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10463983622.

The product of its (nonzero) digits is 786759680, while the sum is 73.

The spelling of 171420845477878 in words is "one hundred seventy-one trillion, four hundred twenty billion, eight hundred forty-five million, four hundred seventy-seven thousand, eight hundred seventy-eight".