660747506 has 8 divisors (see below), whose sum is σ = 991231020. Its totient is φ = 330337168.

The previous prime is 660747491. The next prime is 660747539. The reversal of 660747506 is 605747066.

660747506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 580376281 + 80371225 = 24091^2 + 8965^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22280 + ... + 42636.

Almost surely, 2^660747506 is an apocalyptic number.

660747506 is a deficient number, since it is larger than the sum of its proper divisors (330483514).

660747506 is a wasteful number, since it uses less digits than its factorization.

660747506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36588.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 660747506 is about 25705.0093561547. The cubic root of 660747506 is about 870.9873434125.

The spelling of 660747506 in words is "six hundred sixty million, seven hundred forty-seven thousand, five hundred six".