166233740641 has 4 divisors (see below), whose sum is σ = 166239749572. Its totient is φ = 166227731712.

The previous prime is 166233740611. The next prime is 166233740741. The reversal of 166233740641 is 146047332661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4733440000 + 161500300641 = 68800^2 + 401871^2 .

It is a cyclic number.

It is not a de Polignac number, because 166233740641 - 2⁷ = 166233740513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166233740611) 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, 2962776 + ... + 3018361.

It is an arithmetic number, because the mean of its divisors is an integer number (41559937393).

Almost surely, 2^166233740641 is an apocalyptic number.

It is an amenable number.

166233740641 is a deficient number, since it is larger than the sum of its proper divisors (6008931).

166233740641 is an equidigital number, since it uses as much as digits as its factorization.

166233740641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008930.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 166233740641 in words is "one hundred sixty-six billion, two hundred thirty-three million, seven hundred forty thousand, six hundred forty-one".