166201663 has 4 divisors (see below), whose sum is σ = 166418560. Its totient is φ = 165984768.

The previous prime is 166201631. The next prime is 166201681. The reversal of 166201663 is 366102661.

166201663 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: 366102661 = 23 ⋅15917507.

It is a cyclic number.

It is not a de Polignac number, because 166201663 - 2⁵ = 166201631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166201963) 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, 107295 + ... + 108832.

It is an arithmetic number, because the mean of its divisors is an integer number (41604640).

Almost surely, 2^166201663 is an apocalyptic number.

166201663 is a deficient number, since it is larger than the sum of its proper divisors (216897).

166201663 is an equidigital number, since it uses as much as digits as its factorization.

166201663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216896.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 166201663 is about 12891.9223934990. The cubic root of 166201663 is about 549.8089286704.

The spelling of 166201663 in words is "one hundred sixty-six million, two hundred one thousand, six hundred sixty-three".