666749237 has 16 divisors (see below), whose sum is σ = 859939200. Its totient is φ = 501627840.

The previous prime is 666749201. The next prime is 666749243. The reversal of 666749237 is 732947666.

It is not a de Polignac number, because 666749237 - 2⁶ = 666749173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666749267) 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, 147062 + ... + 151527.

It is an arithmetic number, because the mean of its divisors is an integer number (53746200).

Almost surely, 2^666749237 is an apocalyptic number.

It is an amenable number.

666749237 is a deficient number, since it is larger than the sum of its proper divisors (193189963).

666749237 is a wasteful number, since it uses less digits than its factorization.

666749237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298636.

The product of its digits is 2286144, while the sum is 50.

The square root of 666749237 is about 25821.4878928384. The cubic root of 666749237 is about 873.6165291625.

The spelling of 666749237 in words is "six hundred sixty-six million, seven hundred forty-nine thousand, two hundred thirty-seven".