166620547 has 4 divisors (see below), whose sum is σ = 166902120. Its totient is φ = 166338976.

The previous prime is 166620541. The next prime is 166620607. The reversal of 166620547 is 745026661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166620547 - 2¹⁵ = 166587779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166620541) 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, 139897 + ... + 141082.

It is an arithmetic number, because the mean of its divisors is an integer number (41725530).

Almost surely, 2^166620547 is an apocalyptic number.

166620547 is a deficient number, since it is larger than the sum of its proper divisors (281573).

166620547 is an equidigital number, since it uses as much as digits as its factorization.

166620547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281572.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 166620547 is about 12908.1581567627. The cubic root of 166620547 is about 550.2704422048.

The spelling of 166620547 in words is "one hundred sixty-six million, six hundred twenty thousand, five hundred forty-seven".