660742766 has 4 divisors (see below), whose sum is σ = 991114152. Its totient is φ = 330371382.

The previous prime is 660742759. The next prime is 660742769. The reversal of 660742766 is 667247066.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660742769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165185690 + ... + 165185693.

It is an arithmetic number, because the mean of its divisors is an integer number (247778538).

Almost surely, 2^660742766 is an apocalyptic number.

660742766 is a deficient number, since it is larger than the sum of its proper divisors (330371386).

660742766 is a wasteful number, since it uses less digits than its factorization.

660742766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330371385.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 660742766 is about 25704.9171560618. The cubic root of 660742766 is about 870.9852606755.

The spelling of 660742766 in words is "six hundred sixty million, seven hundred forty-two thousand, seven hundred sixty-six".