166487709 has 8 divisors (see below), whose sum is σ = 233667040. Its totient is φ = 105150096.

The previous prime is 166487689. The next prime is 166487779. The reversal of 166487709 is 907784661.

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

It is not a de Polignac number, because 166487709 - 2¹² = 166483613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166487779) 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, 1460362 + ... + 1460475.

It is an arithmetic number, because the mean of its divisors is an integer number (29208380).

Almost surely, 2^166487709 is an apocalyptic number.

166487709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

166487709 is a deficient number, since it is larger than the sum of its proper divisors (67179331).

166487709 is a wasteful number, since it uses less digits than its factorization.

166487709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920859.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 166487709 is about 12903.0116251982. The cubic root of 166487709 is about 550.1241692104.

The spelling of 166487709 in words is "one hundred sixty-six million, four hundred eighty-seven thousand, seven hundred nine".