166742452821 has 32 divisors (see below), whose sum is σ = 258121340928. Its totient is φ = 93772082880.

The previous prime is 166742452787. The next prime is 166742452841. The reversal of 166742452821 is 128254247661.

It is not a de Polignac number, because 166742452821 - 2¹¹ = 166742450773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166742452841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740115 + ... + 938751.

It is an arithmetic number, because the mean of its divisors is an integer number (8066291904).

Almost surely, 2^166742452821 is an apocalyptic number.

It is an amenable number.

166742452821 is a deficient number, since it is larger than the sum of its proper divisors (91378888107).

166742452821 is a wasteful number, since it uses less digits than its factorization.

166742452821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199281.

The product of its digits is 1290240, while the sum is 48.

The spelling of 166742452821 in words is "one hundred sixty-six billion, seven hundred forty-two million, four hundred fifty-two thousand, eight hundred twenty-one".