166660541517 has 4 divisors (see below), whose sum is σ = 222214055360. Its totient is φ = 111107027676.

The previous prime is 166660541513. The next prime is 166660541533. The reversal of 166660541517 is 715145066661.

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 166660541517 - 2² = 166660541513 is a prime.

It is a super-2 number, since 2×166660541517² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166660541513) 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, 27776756917 + ... + 27776756922.

It is an arithmetic number, because the mean of its divisors is an integer number (55553513840).

Almost surely, 2^166660541517 is an apocalyptic number.

It is an amenable number.

166660541517 is a deficient number, since it is larger than the sum of its proper divisors (55553513843).

166660541517 is an equidigital number, since it uses as much as digits as its factorization.

166660541517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55553513842.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 166660541517 in words is "one hundred sixty-six billion, six hundred sixty million, five hundred forty-one thousand, five hundred seventeen".