166715478517 has 8 divisors (see below), whose sum is σ = 190546158656. Its totient is φ = 142888344192.

The previous prime is 166715478499. The next prime is 166715478539. The reversal of 166715478517 is 715874517661.

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 166715478517 - 2¹¹ = 166715476469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166715478557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 784923 + ... + 974440.

It is an arithmetic number, because the mean of its divisors is an integer number (23818269832).

Almost surely, 2^166715478517 is an apocalyptic number.

It is an amenable number.

166715478517 is a deficient number, since it is larger than the sum of its proper divisors (23830680139).

166715478517 is a wasteful number, since it uses less digits than its factorization.

166715478517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772907.

The product of its digits is 9878400, while the sum is 58.

The spelling of 166715478517 in words is "one hundred sixty-six billion, seven hundred fifteen million, four hundred seventy-eight thousand, five hundred seventeen".