660320947 has 16 divisors (see below), whose sum is σ = 785594880. Its totient is φ = 547092000.

The previous prime is 660320933. The next prime is 660320963. The reversal of 660320947 is 749023066.

It is not a de Polignac number, because 660320947 - 2⁷ = 660320819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660320917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17929 + ... + 40522.

It is an arithmetic number, because the mean of its divisors is an integer number (49099680).

Almost surely, 2^660320947 is an apocalyptic number.

660320947 is a deficient number, since it is larger than the sum of its proper divisors (125273933).

660320947 is a wasteful number, since it uses less digits than its factorization.

660320947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58554.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 660320947 is about 25696.7108206478. The cubic root of 660320947 is about 870.7998751968.

The spelling of 660320947 in words is "six hundred sixty million, three hundred twenty thousand, nine hundred forty-seven".