171661203266 has 32 divisors (see below), whose sum is σ = 295145719680. Its totient is φ = 73351910016.

The previous prime is 171661203251. The next prime is 171661203281. The reversal of 171661203266 is 662302166171.

It is an interprime number because it is at equal distance from previous prime (171661203251) and next prime (171661203281).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16407545 + ... + 16418003.

It is an arithmetic number, because the mean of its divisors is an integer number (9223303740).

Almost surely, 2^171661203266 is an apocalyptic number.

171661203266 is a deficient number, since it is larger than the sum of its proper divisors (123484516414).

171661203266 is a wasteful number, since it uses less digits than its factorization.

171661203266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13818.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 171661203266 in words is "one hundred seventy-one billion, six hundred sixty-one million, two hundred three thousand, two hundred sixty-six".