166335978372479 has 8 divisors (see below), whose sum is σ = 173575698623712. Its totient is φ = 159096901553920.

The previous prime is 166335978372467. The next prime is 166335978372521. The reversal of 166335978372479 is 974273879533661.

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 166335978372479 - 2¹⁶ = 166335978306943 is a prime.

It is a super-2 number, since 2×166335978372479² (a number of 29 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 (166335978272479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160329854 + ... + 161363979.

It is an arithmetic number, because the mean of its divisors is an integer number (21696962327964).

Almost surely, 2^{166335978372479} is an apocalyptic number.

166335978372479 is a deficient number, since it is larger than the sum of its proper divisors (7239720251233).

166335978372479 is a wasteful number, since it uses less digits than its factorization.

166335978372479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321716337.

The product of its digits is 8641624320, while the sum is 80.

The spelling of 166335978372479 in words is "one hundred sixty-six trillion, three hundred thirty-five billion, nine hundred seventy-eight million, three hundred seventy-two thousand, four hundred seventy-nine".