166666437 has 16 divisors (see below), whose sum is σ = 282186880. Its totient is φ = 95237856.

The previous prime is 166666417. The next prime is 166666469. The reversal of 166666437 is 734666661.

166666437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166666437 - 2¹¹ = 166664389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166666392 and 166666401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440728 + ... + 441105.

It is an arithmetic number, because the mean of its divisors is an integer number (17636680).

Almost surely, 2^166666437 is an apocalyptic number.

It is an amenable number.

166666437 is a deficient number, since it is larger than the sum of its proper divisors (115520443).

166666437 is an equidigital number, since it uses as much as digits as its factorization.

166666437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881849 (or 881843 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 166666437 is about 12909.9355924032. The cubic root of 166666437 is about 550.3209553681.

The spelling of 166666437 in words is "one hundred sixty-six million, six hundred sixty-six thousand, four hundred thirty-seven".