166025476401 has 4 divisors (see below), whose sum is σ = 221367301872. Its totient is φ = 110683650932.

The previous prime is 166025476391. The next prime is 166025476417. The reversal of 166025476401 is 104674520661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104674520661 = 3 ⋅34891506887.

It is a cyclic number.

It is not a de Polignac number, because 166025476401 - 2¹⁰ = 166025475377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166025476451) 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, 27670912731 + ... + 27670912736.

It is an arithmetic number, because the mean of its divisors is an integer number (55341825468).

Almost surely, 2^166025476401 is an apocalyptic number.

It is an amenable number.

166025476401 is a deficient number, since it is larger than the sum of its proper divisors (55341825471).

166025476401 is an equidigital number, since it uses as much as digits as its factorization.

166025476401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55341825470.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 166025476401 in words is "one hundred sixty-six billion, twenty-five million, four hundred seventy-six thousand, four hundred one".