660770447 has 4 divisors (see below), whose sum is σ = 661214520. Its totient is φ = 660326376.

The previous prime is 660770431. The next prime is 660770471. The reversal of 660770447 is 744077066.

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

It is a cyclic number.

It is not a de Polignac number, because 660770447 - 2⁴ = 660770431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660770497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219797 + ... + 222782.

It is an arithmetic number, because the mean of its divisors is an integer number (165303630).

Almost surely, 2^660770447 is an apocalyptic number.

660770447 is a deficient number, since it is larger than the sum of its proper divisors (444073).

660770447 is a wasteful number, since it uses less digits than its factorization.

660770447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444072.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 660770447 is about 25705.4555882599. The cubic root of 660770447 is about 870.9974234553.

The spelling of 660770447 in words is "six hundred sixty million, seven hundred seventy thousand, four hundred forty-seven".