171866853851 has 16 divisors (see below), whose sum is σ = 214286830080. Its totient is φ = 133915178880.

The previous prime is 171866853833. The next prime is 171866853859. The reversal of 171866853851 is 158358668171.

It is not a de Polignac number, because 171866853851 - 2⁶ = 171866853787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171866853859) 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, 1790210 + ... + 1883768.

It is an arithmetic number, because the mean of its divisors is an integer number (13392926880).

Almost surely, 2^171866853851 is an apocalyptic number.

171866853851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

171866853851 is a deficient number, since it is larger than the sum of its proper divisors (42419976229).

171866853851 is a wasteful number, since it uses less digits than its factorization.

171866853851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117434.

The product of its digits is 9676800, while the sum is 59.

The spelling of 171866853851 in words is "one hundred seventy-one billion, eight hundred sixty-six million, eight hundred fifty-three thousand, eight hundred fifty-one".