166561347 has 8 divisors (see below), whose sum is σ = 222143680. Its totient is φ = 111009960.

The previous prime is 166561327. The next prime is 166561411. The reversal of 166561347 is 743165661.

166561347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 166561347 - 2¹⁶ = 166495811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166561327) 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, 12072 + ... + 21882.

It is an arithmetic number, because the mean of its divisors is an integer number (27767960).

Almost surely, 2^166561347 is an apocalyptic number.

166561347 is a deficient number, since it is larger than the sum of its proper divisors (55582333).

166561347 is an equidigital number, since it uses as much as digits as its factorization.

166561347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15473.

The product of its digits is 90720, while the sum is 39.

The square root of 166561347 is about 12905.8648296036. The cubic root of 166561347 is about 550.2052644310.

The spelling of 166561347 in words is "one hundred sixty-six million, five hundred sixty-one thousand, three hundred forty-seven".