172660643 has 4 divisors (see below), whose sum is σ = 172904880. Its totient is φ = 172416408.

The previous prime is 172660639. The next prime is 172660661. The reversal of 172660643 is 346066271.

172660643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346066271 = 631 ⋅548441.

It is a cyclic number.

It is not a de Polignac number, because 172660643 - 2² = 172660639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172660633) 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, 121055 + ... + 122472.

It is an arithmetic number, because the mean of its divisors is an integer number (43226220).

Almost surely, 2^172660643 is an apocalyptic number.

172660643 is a deficient number, since it is larger than the sum of its proper divisors (244237).

172660643 is an equidigital number, since it uses as much as digits as its factorization.

172660643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244236.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 172660643 is about 13140.0396879157. The cubic root of 172660643 is about 556.8408887704.

The spelling of 172660643 in words is "one hundred seventy-two million, six hundred sixty thousand, six hundred forty-three".