166155565651001 has 4 divisors (see below), whose sum is σ = 166337953759104. Its totient is φ = 165973177542900.

The previous prime is 166155565650959. The next prime is 166155565651003. The reversal of 166155565651001 is 100156565551661.

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 a cyclic number.

It is not a de Polignac number, because 166155565651001 - 2³⁰ = 166154491909177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166155565651003) 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, 91194052685 + ... + 91194054506.

It is an arithmetic number, because the mean of its divisors is an integer number (41584488439776).

Almost surely, 2^{166155565651001} is an apocalyptic number.

It is an amenable number.

166155565651001 is a deficient number, since it is larger than the sum of its proper divisors (182388108103).

166155565651001 is an equidigital number, since it uses as much as digits as its factorization.

166155565651001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182388108102.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 166155565651001 in words is "one hundred sixty-six trillion, one hundred fifty-five billion, five hundred sixty-five million, six hundred fifty-one thousand, one".