166011273983 has 4 divisors (see below), whose sum is σ = 170060329488. Its totient is φ = 161962218480.

The previous prime is 166011273959. The next prime is 166011274019. The reversal of 166011273983 is 389372110661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389372110661 = 267497 ⋅1455613.

It is a cyclic number.

It is not a de Polignac number, because 166011273983 - 2¹² = 166011269887 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 (166011273383) 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, 2024527691 + ... + 2024527772.

It is an arithmetic number, because the mean of its divisors is an integer number (42515082372).

Almost surely, 2^166011273983 is an apocalyptic number.

166011273983 is a deficient number, since it is larger than the sum of its proper divisors (4049055505).

166011273983 is an equidigital number, since it uses as much as digits as its factorization.

166011273983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049055504.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 166011273983 in words is "one hundred sixty-six billion, eleven million, two hundred seventy-three thousand, nine hundred eighty-three".