172617661 has 8 divisors (see below), whose sum is σ = 178503264. Its totient is φ = 166829520.

The previous prime is 172617649. The next prime is 172617689. The reversal of 172617661 is 166716271.

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

It is a cyclic number.

It is not a de Polignac number, because 172617661 - 2⁵ = 172617629 is a prime.

It is a super-2 number, since 2×172617661² = 59593713778221842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172617661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172617631) 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, 20755 + ... + 27856.

It is an arithmetic number, because the mean of its divisors is an integer number (22312908).

Almost surely, 2^172617661 is an apocalyptic number.

It is an amenable number.

172617661 is a deficient number, since it is larger than the sum of its proper divisors (5885603).

172617661 is an equidigital number, since it uses as much as digits as its factorization.

172617661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48731.

The product of its digits is 21168, while the sum is 37.

The square root of 172617661 is about 13138.4040507209. The cubic root of 172617661 is about 556.7946784297.

The spelling of 172617661 in words is "one hundred seventy-two million, six hundred seventeen thousand, six hundred sixty-one".