166657539543 has 24 divisors (see below), whose sum is σ = 257509242240. Its totient is φ = 95063118720.

The previous prime is 166657539523. The next prime is 166657539617. The reversal of 166657539543 is 345935756661.

It is not a de Polignac number, because 166657539543 - 2¹³ = 166657531351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166657539523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8727883 + ... + 8746956.

It is an arithmetic number, because the mean of its divisors is an integer number (10729551760).

Almost surely, 2^166657539543 is an apocalyptic number.

166657539543 is a deficient number, since it is larger than the sum of its proper divisors (90851702697).

166657539543 is a wasteful number, since it uses less digits than its factorization.

166657539543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17474887 (or 17474870 counting only the distinct ones).

The product of its digits is 61236000, while the sum is 60.

The spelling of 166657539543 in words is "one hundred sixty-six billion, six hundred fifty-seven million, five hundred thirty-nine thousand, five hundred forty-three".