171222020785 has 8 divisors (see below), whose sum is σ = 205665719616. Its totient is φ = 136844753520.

The previous prime is 171222020773. The next prime is 171222020789. The reversal of 171222020785 is 587020222171.

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

It is not a de Polignac number, because 171222020785 - 2¹⁹ = 171221496497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171222020789) 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, 16602219 + ... + 16612528.

It is an arithmetic number, because the mean of its divisors is an integer number (25708214952).

Almost surely, 2^171222020785 is an apocalyptic number.

It is an amenable number.

171222020785 is a deficient number, since it is larger than the sum of its proper divisors (34443698831).

171222020785 is a wasteful number, since it uses less digits than its factorization.

171222020785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33215783.

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 171222020785 in words is "one hundred seventy-one billion, two hundred twenty-two million, twenty thousand, seven hundred eighty-five".