166561445136041 has 8 divisors (see below), whose sum is σ = 168154475978304. Its totient is φ = 164969088031440.

The previous prime is 166561445136029. The next prime is 166561445136067. The reversal of 166561445136041 is 140631544165661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166561445136041 - 2⁶ = 166561445135977 is a prime.

It is a super-3 number, since 3×166561445136041³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166561445136011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167937605 + ... + 168926498.

It is an arithmetic number, because the mean of its divisors is an integer number (21019309497288).

Almost surely, 2^{166561445136041} is an apocalyptic number.

It is an amenable number.

166561445136041 is a deficient number, since it is larger than the sum of its proper divisors (1593030842263).

166561445136041 is a wasteful number, since it uses less digits than its factorization.

166561445136041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336868831.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 166561445136041 in words is "one hundred sixty-six trillion, five hundred sixty-one billion, four hundred forty-five million, one hundred thirty-six thousand, forty-one".