666281637 has 24 divisors (see below), whose sum is σ = 1101160320. Its totient is φ = 380293920.

The previous prime is 666281597. The next prime is 666281653. The reversal of 666281637 is 736182666.

It is not a de Polignac number, because 666281637 - 2¹⁸ = 666019493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666281592 and 666281601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666281137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53664 + ... + 64902.

It is an arithmetic number, because the mean of its divisors is an integer number (45881680).

Almost surely, 2^666281637 is an apocalyptic number.

It is an amenable number.

666281637 is a deficient number, since it is larger than the sum of its proper divisors (434878683).

666281637 is a wasteful number, since it uses less digits than its factorization.

666281637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12193 (or 12190 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 666281637 is about 25812.4318304185. The cubic root of 666281637 is about 873.4122551517.

It can be divided in two parts, 66628 and 1637, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 666281637 in words is "six hundred sixty-six million, two hundred eighty-one thousand, six hundred thirty-seven".