171212775676428 has 24 divisors (see below), whose sum is σ = 420522606925120. Its totient is φ = 54067192318800.

The previous prime is 171212775676381. The next prime is 171212775676429. The reversal of 171212775676428 is 824676577212171.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (171212775676429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375466613098 + ... + 375466613553.

Almost surely, 2^{171212775676428} is an apocalyptic number.

It is an amenable number.

171212775676428 is an abundant number, since it is smaller than the sum of its proper divisors (249309831248692).

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

171212775676428 is a wasteful number, since it uses less digits than its factorization.

171212775676428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750933226677 (or 750933226675 counting only the distinct ones).

The product of its digits is 110638080, while the sum is 66.

The spelling of 171212775676428 in words is "one hundred seventy-one trillion, two hundred twelve billion, seven hundred seventy-five million, six hundred seventy-six thousand, four hundred twenty-eight".