666703745 has 8 divisors (see below), whose sum is σ = 800505384. Its totient is φ = 533055744.

The previous prime is 666703721. The next prime is 666703757. The reversal of 666703745 is 547307666.

It can be written as a sum of positive squares in 4 ways, for example, as 1270129 + 665433616 = 1127^2 + 25796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666703745 - 2²⁸ = 398268289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666703696 and 666703705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28634 + ... + 46403.

It is an arithmetic number, because the mean of its divisors is an integer number (100063173).

Almost surely, 2^666703745 is an apocalyptic number.

It is an amenable number.

666703745 is a deficient number, since it is larger than the sum of its proper divisors (133801639).

666703745 is a wasteful number, since it uses less digits than its factorization.

666703745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76819.

The product of its (nonzero) digits is 635040, while the sum is 44.

The square root of 666703745 is about 25820.6069835703. The cubic root of 666703745 is about 873.5966598899.

The spelling of 666703745 in words is "six hundred sixty-six million, seven hundred three thousand, seven hundred forty-five".