660649147 has 4 divisors (see below), whose sum is σ = 660701016. Its totient is φ = 660597280.

The previous prime is 660649127. The next prime is 660649193. The reversal of 660649147 is 741946066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 741946066 = 2 ⋅370973033.

It is a cyclic number.

It is not a de Polignac number, because 660649147 - 2²⁷ = 526431419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660649117) 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, 7788 + ... + 37174.

It is an arithmetic number, because the mean of its divisors is an integer number (165175254).

Almost surely, 2^660649147 is an apocalyptic number.

660649147 is a deficient number, since it is larger than the sum of its proper divisors (51869).

660649147 is a wasteful number, since it uses less digits than its factorization.

660649147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51868.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 660649147 is about 25703.0960586463. The cubic root of 660649147 is about 870.9441228204.

The spelling of 660649147 in words is "six hundred sixty million, six hundred forty-nine thousand, one hundred forty-seven".