166005142637 has 4 divisors (see below), whose sum is σ = 166006375260. Its totient is φ = 166003910016.

The previous prime is 166005142591. The next prime is 166005142669. The reversal of 166005142637 is 736241500661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164538941956 + 1466200681 = 405634^2 + 38291^2 .

It is a cyclic number.

It is not a de Polignac number, because 166005142637 - 2²⁸ = 165736707181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166005142594 and 166005142603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166005142837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385478 + ... + 693255.

It is an arithmetic number, because the mean of its divisors is an integer number (41501593815).

Almost surely, 2^166005142637 is an apocalyptic number.

It is an amenable number.

166005142637 is a deficient number, since it is larger than the sum of its proper divisors (1232623).

166005142637 is a wasteful number, since it uses less digits than its factorization.

166005142637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232622.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 166005142637 in words is "one hundred sixty-six billion, five million, one hundred forty-two thousand, six hundred thirty-seven".