660444742 has 4 divisors (see below), whose sum is σ = 990667116. Its totient is φ = 330222370.

The previous prime is 660444691. The next prime is 660444749. The reversal of 660444742 is 247444066.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660444749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165111184 + ... + 165111187.

It is an arithmetic number, because the mean of its divisors is an integer number (247666779).

Almost surely, 2^660444742 is an apocalyptic number.

660444742 is a deficient number, since it is larger than the sum of its proper divisors (330222374).

660444742 is a wasteful number, since it uses less digits than its factorization.

660444742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330222373.

The product of its (nonzero) digits is 129024, while the sum is 37.

The square root of 660444742 is about 25699.1194790794. The cubic root of 660444742 is about 870.8542901168.

The spelling of 660444742 in words is "six hundred sixty million, four hundred forty-four thousand, seven hundred forty-two".