660147587647 has 4 divisors (see below), whose sum is σ = 669190705360. Its totient is φ = 651104469936.

The previous prime is 660147587609. The next prime is 660147587681. The reversal of 660147587647 is 746785741066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746785741066 = 2 ⋅373392870533.

It is a cyclic number.

It is not a de Polignac number, because 660147587647 - 2¹¹ = 660147585599 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 (660147587147) 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, 4521558747 + ... + 4521558892.

It is an arithmetic number, because the mean of its divisors is an integer number (167297676340).

Almost surely, 2^660147587647 is an apocalyptic number.

660147587647 is a deficient number, since it is larger than the sum of its proper divisors (9043117713).

660147587647 is an equidigital number, since it uses as much as digits as its factorization.

660147587647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9043117712.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 660147587647 in words is "six hundred sixty billion, one hundred forty-seven million, five hundred eighty-seven thousand, six hundred forty-seven".