166465975501 has 4 divisors (see below), whose sum is σ = 190246829152. Its totient is φ = 142685121852.

The previous prime is 166465975499. The next prime is 166465975531. The reversal of 166465975501 is 105579564661.

It is a happy number.

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.

It is not a de Polignac number, because 166465975501 - 2¹ = 166465975499 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 (166465975531) 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 3 ways as a sum of consecutive naturals, for example, 11890426815 + ... + 11890426828.

It is an arithmetic number, because the mean of its divisors is an integer number (47561707288).

Almost surely, 2^166465975501 is an apocalyptic number.

It is an amenable number.

166465975501 is a deficient number, since it is larger than the sum of its proper divisors (23780853651).

166465975501 is an equidigital number, since it uses as much as digits as its factorization.

166465975501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23780853650.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 166465975501 in words is "one hundred sixty-six billion, four hundred sixty-five million, nine hundred seventy-five thousand, five hundred one".