666137 has 4 divisors (see below), whose sum is σ = 667776. Its totient is φ = 664500.

The previous prime is 666119. The next prime is 666139. The reversal of 666137 is 731666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 666137 - 2⁶ = 666073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666139) 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, 308 + ... + 1194.

It is an arithmetic number, because the mean of its divisors is an integer number (166944).

2⁶⁶⁶¹³⁷ is an apocalyptic number.

It is an amenable number.

666137 is a deficient number, since it is larger than the sum of its proper divisors (1639).

666137 is an equidigital number, since it uses as much as digits as its factorization.

666137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638.

The product of its digits is 4536, while the sum is 29.

The square root of 666137 is about 816.1721632107. The cubic root of 666137 is about 87.3349050213.

The spelling of 666137 in words is "six hundred sixty-six thousand, one hundred thirty-seven".