666834637 has 16 divisors (see below), whose sum is σ = 781189632. Its totient is φ = 557343360.

The previous prime is 666834631. The next prime is 666834643. The reversal of 666834637 is 736438666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666834631) and next prime (666834643).

It is a de Polignac number, because none of the positive numbers 2^k-666834637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666834631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88843 + ... + 96055.

It is an arithmetic number, because the mean of its divisors is an integer number (48824352).

Almost surely, 2^666834637 is an apocalyptic number.

It is an amenable number.

666834637 is a deficient number, since it is larger than the sum of its proper divisors (114354995).

666834637 is a wasteful number, since it uses less digits than its factorization.

666834637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548.

The product of its digits is 2612736, while the sum is 49.

The square root of 666834637 is about 25823.1415013743. The cubic root of 666834637 is about 873.6538263763.

The spelling of 666834637 in words is "six hundred sixty-six million, eight hundred thirty-four thousand, six hundred thirty-seven".