172064661 has 4 divisors (see below), whose sum is σ = 229419552. Its totient is φ = 114709772.

The previous prime is 172064657. The next prime is 172064671. The reversal of 172064661 is 166460271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166460271 = 3 ⋅55486757.

It is a cyclic number.

It is not a de Polignac number, because 172064661 - 2² = 172064657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172064611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28677441 + ... + 28677446.

It is an arithmetic number, because the mean of its divisors is an integer number (57354888).

Almost surely, 2^172064661 is an apocalyptic number.

It is an amenable number.

172064661 is a deficient number, since it is larger than the sum of its proper divisors (57354891).

172064661 is an equidigital number, since it uses as much as digits as its factorization.

172064661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57354890.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 172064661 is about 13117.3419944743. The cubic root of 172064661 is about 556.1994576642.

The spelling of 172064661 in words is "one hundred seventy-two million, sixty-four thousand, six hundred sixty-one".