66166437 has 8 divisors (see below), whose sum is σ = 88397280. Its totient is φ = 44023280.

The previous prime is 66166421. The next prime is 66166439. The reversal of 66166437 is 73466166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66166437 - 2⁴ = 66166421 is a prime.

It is a super-4 number, since 4×66166437⁴ (a number of 32 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66166395 and 66166404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66166439) 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, 20139 + ... + 23192.

It is an arithmetic number, because the mean of its divisors is an integer number (11049660).

Almost surely, 2^66166437 is an apocalyptic number.

It is an amenable number.

66166437 is a deficient number, since it is larger than the sum of its proper divisors (22230843).

66166437 is a wasteful number, since it uses less digits than its factorization.

66166437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43843.

The product of its digits is 108864, while the sum is 39.

The square root of 66166437 is about 8134.2754440700. The cubic root of 66166437 is about 404.4634198727.

The spelling of 66166437 in words is "sixty-six million, one hundred sixty-six thousand, four hundred thirty-seven".