163666764427 has 16 divisors (see below), whose sum is σ = 185856780960. Its totient is φ = 143178527232.

The previous prime is 163666764421. The next prime is 163666764431. The reversal of 163666764427 is 724467666361.

It is a cyclic number.

It is not a de Polignac number, because 163666764427 - 2³ = 163666764419 is a prime.

It is a super-2 number, since 2×163666764427² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163666764421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4763148 + ... + 4797385.

It is an arithmetic number, because the mean of its divisors is an integer number (11616048810).

Almost surely, 2^163666764427 is an apocalyptic number.

163666764427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

163666764427 is a deficient number, since it is larger than the sum of its proper divisors (22190016533).

163666764427 is a wasteful number, since it uses less digits than its factorization.

163666764427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560622.

The product of its digits is 36578304, while the sum is 58.

The spelling of 163666764427 in words is "one hundred sixty-three billion, six hundred sixty-six million, seven hundred sixty-four thousand, four hundred twenty-seven".