163666051 has 4 divisors (see below), whose sum is σ = 163979512. Its totient is φ = 163352592.

The previous prime is 163666049. The next prime is 163666093. The reversal of 163666051 is 150666361.

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 163666051 - 2¹ = 163666049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163665998 and 163666016.

It is not an unprimeable number, because it can be changed into a prime (163666351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155946 + ... + 156991.

It is an arithmetic number, because the mean of its divisors is an integer number (40994878).

Almost surely, 2^163666051 is an apocalyptic number.

163666051 is a deficient number, since it is larger than the sum of its proper divisors (313461).

163666051 is an equidigital number, since it uses as much as digits as its factorization.

163666051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313460.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 163666051 is about 12793.2033126969. The cubic root of 163666051 is about 546.9985829267.

It can be divided in two parts, 1636660 and 51, that multiplied together give a triangular number (83469660 = T₁₂₉₂₀).

The spelling of 163666051 in words is "one hundred sixty-three million, six hundred sixty-six thousand, fifty-one".