166556533 has 8 divisors (see below), whose sum is σ = 195674976. Its totient is φ = 139767600.

The previous prime is 166556519. The next prime is 166556539. The reversal of 166556533 is 335655661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166556533 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 (166556539) 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, 582223 + ... + 582508.

It is an arithmetic number, because the mean of its divisors is an integer number (24459372).

Almost surely, 2^166556533 is an apocalyptic number.

166556533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166556533 is a deficient number, since it is larger than the sum of its proper divisors (29118443).

166556533 is a wasteful number, since it uses less digits than its factorization.

166556533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164755.

The product of its digits is 243000, while the sum is 40.

The square root of 166556533 is about 12905.6783239007. The cubic root of 166556533 is about 550.1999636540.

The spelling of 166556533 in words is "one hundred sixty-six million, five hundred fifty-six thousand, five hundred thirty-three".