166742539 has 8 divisors (see below), whose sum is σ = 167917568. Its totient is φ = 165571560.

The previous prime is 166742533. The next prime is 166742551. The reversal of 166742539 is 935247661.

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 166742539 - 2⁵ = 166742507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166742495 and 166742504.

It is not an unprimeable number, because it can be changed into a prime (166742533) 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, 152854 + ... + 153940.

It is an arithmetic number, because the mean of its divisors is an integer number (20989696).

Almost surely, 2^166742539 is an apocalyptic number.

166742539 is a deficient number, since it is larger than the sum of its proper divisors (1175029).

166742539 is a wasteful number, since it uses less digits than its factorization.

166742539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025.

The product of its digits is 272160, while the sum is 43.

The square root of 166742539 is about 12912.8826758397. The cubic root of 166742539 is about 550.4047037887.

It can be divided in two parts, 166742 and 539, that added together give a square (167281 = 409²).

The spelling of 166742539 in words is "one hundred sixty-six million, seven hundred forty-two thousand, five hundred thirty-nine".