166987471 has 8 divisors (see below), whose sum is σ = 194444064. Its totient is φ = 140431200.

The previous prime is 166987463. The next prime is 166987477. The reversal of 166987471 is 174789661.

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

It is not a de Polignac number, because 166987471 - 2³ = 166987463 is a prime.

It is a super-3 number, since 3×166987471³ (a number of 26 digits) contains 333 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 (166987477) 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, 224680 + ... + 225421.

It is an arithmetic number, because the mean of its divisors is an integer number (24305508).

Almost surely, 2^166987471 is an apocalyptic number.

166987471 is a deficient number, since it is larger than the sum of its proper divisors (27456593).

166987471 is an equidigital number, since it uses as much as digits as its factorization.

166987471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450161.

The product of its digits is 508032, while the sum is 49.

The square root of 166987471 is about 12922.3632126635. The cubic root of 166987471 is about 550.6740727015.

The spelling of 166987471 in words is "one hundred sixty-six million, nine hundred eighty-seven thousand, four hundred seventy-one".