166478551 has 8 divisors (see below), whose sum is σ = 176212400. Its totient is φ = 156841920.

The previous prime is 166478549. The next prime is 166478621. The reversal of 166478551 is 155874661.

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 166478551 - 2¹ = 166478549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166478498 and 166478507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166478051) 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, 20766 + ... + 27643.

It is an arithmetic number, because the mean of its divisors is an integer number (22026550).

Almost surely, 2^166478551 is an apocalyptic number.

166478551 is a deficient number, since it is larger than the sum of its proper divisors (9733849).

166478551 is a wasteful number, since it uses less digits than its factorization.

166478551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48609.

The product of its digits is 201600, while the sum is 43.

The square root of 166478551 is about 12902.6567419272. The cubic root of 166478551 is about 550.1140821203.

The spelling of 166478551 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, five hundred fifty-one".