171612661 has 8 divisors (see below), whose sum is σ = 190008864. Its totient is φ = 153682320.

The previous prime is 171612659. The next prime is 171612673. The reversal of 171612661 is 166216171.

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

It is not a de Polignac number, because 171612661 - 2¹ = 171612659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171612611) 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, 115690 + ... + 117163.

It is an arithmetic number, because the mean of its divisors is an integer number (23751108).

Almost surely, 2^171612661 is an apocalyptic number.

171612661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

171612661 is a deficient number, since it is larger than the sum of its proper divisors (18396203).

171612661 is a wasteful number, since it uses less digits than its factorization.

171612661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232931.

The product of its digits is 3024, while the sum is 31.

The square root of 171612661 is about 13100.1015644918. The cubic root of 171612661 is about 555.7120001914.

The spelling of 171612661 in words is "one hundred seventy-one million, six hundred twelve thousand, six hundred sixty-one".