166554204201 has 24 divisors (see below), whose sum is σ = 299941771584. Its totient is φ = 86521664160.

The previous prime is 166554204191. The next prime is 166554204211. The reversal of 166554204201 is 102402455661.

166554204201 is a `hidden beast` number, since 1 + 66 + 554 + 2 + 0 + 42 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (166554204191) and next prime (166554204211).

It is not a de Polignac number, because 166554204201 - 2⁵ = 166554204169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166554204211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120168286 + ... + 120169671.

It is an arithmetic number, because the mean of its divisors is an integer number (12497573816).

Almost surely, 2^166554204201 is an apocalyptic number.

166554204201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166554204201 is a deficient number, since it is larger than the sum of its proper divisors (133387567383).

166554204201 is a wasteful number, since it uses less digits than its factorization.

166554204201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240337981 (or 240337978 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 166554204201 its reverse (102402455661), we get a palindrome (268956659862).

The spelling of 166554204201 in words is "one hundred sixty-six billion, five hundred fifty-four million, two hundred four thousand, two hundred one".