660386147 has 4 divisors (see below), whose sum is σ = 661136616. Its totient is φ = 659635680.

The previous prime is 660386137. The next prime is 660386161. The reversal of 660386147 is 741683066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660386147 is a prime.

It is a super-2 number, since 2×660386147² = 872219726299011218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660386107) 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, 373913 + ... + 375674.

It is an arithmetic number, because the mean of its divisors is an integer number (165284154).

Almost surely, 2^660386147 is an apocalyptic number.

660386147 is a deficient number, since it is larger than the sum of its proper divisors (750469).

660386147 is an equidigital number, since it uses as much as digits as its factorization.

660386147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750468.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 660386147 is about 25697.9794341890. The cubic root of 660386147 is about 870.8285351404.

The spelling of 660386147 in words is "six hundred sixty million, three hundred eighty-six thousand, one hundred forty-seven".