666687370 has 16 divisors (see below), whose sum is σ = 1200837960. Its totient is φ = 266497024.

The previous prime is 666687337. The next prime is 666687377. The reversal of 666687370 is 73786666.

It can be written as a sum of positive squares in 4 ways, for example, as 149989009 + 516698361 = 12247^2 + 22731^2 .

It is not an unprimeable number, because it can be changed into a prime (666687377) 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, 5935 + ... + 36994.

Almost surely, 2^666687370 is an apocalyptic number.

666687370 is a deficient number, since it is larger than the sum of its proper divisors (534150590).

666687370 is a wasteful number, since it uses less digits than its factorization.

666687370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44489.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The square root of 666687370 is about 25820.2898899296. The cubic root of 666687370 is about 873.5895076565.

The spelling of 666687370 in words is "six hundred sixty-six million, six hundred eighty-seven thousand, three hundred seventy".