166065053561 has 8 divisors (see below), whose sum is σ = 181173619200. Its totient is φ = 150958445040.

The previous prime is 166065053549. The next prime is 166065053573. The reversal of 166065053561 is 165350560661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (166065053549) and next prime (166065053573).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166065053561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166065053761) 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, 308966 + ... + 653903.

It is an arithmetic number, because the mean of its divisors is an integer number (22646702400).

Almost surely, 2^166065053561 is an apocalyptic number.

166065053561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166065053561 is a deficient number, since it is larger than the sum of its proper divisors (15108565639).

166065053561 is a wasteful number, since it uses less digits than its factorization.

166065053561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978559.

The product of its (nonzero) digits is 486000, while the sum is 44.

Subtracting from 166065053561 its reverse (165350560661), we obtain a square (714492900 = 26730²).

The spelling of 166065053561 in words is "one hundred sixty-six billion, sixty-five million, fifty-three thousand, five hundred sixty-one".