171426778145 has 16 divisors (see below), whose sum is σ = 235703969280. Its totient is φ = 117247596864.

The previous prime is 171426778141. The next prime is 171426778183. The reversal of 171426778145 is 541877624171.

It is a cyclic number.

It is not a de Polignac number, because 171426778145 - 2² = 171426778141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (171426778141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6281897 + ... + 6309126.

It is an arithmetic number, because the mean of its divisors is an integer number (14731498080).

Almost surely, 2^171426778145 is an apocalyptic number.

It is an amenable number.

171426778145 is a deficient number, since it is larger than the sum of its proper divisors (64277191135).

171426778145 is a wasteful number, since it uses less digits than its factorization.

171426778145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12591424.

The product of its digits is 2634240, while the sum is 53.

The spelling of 171426778145 in words is "one hundred seventy-one billion, four hundred twenty-six million, seven hundred seventy-eight thousand, one hundred forty-five".