660666532 has 6 divisors (see below), whose sum is σ = 1156166438. Its totient is φ = 330333264.

The previous prime is 660666527. The next prime is 660666533. The reversal of 660666532 is 235666066.

It can be written as a sum of positive squares in only one way, i.e., 616230976 + 44435556 = 24824^2 + 6666^2 .

It is not an unprimeable number, because it can be changed into a prime (660666533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82583313 + ... + 82583320.

Almost surely, 2^660666532 is an apocalyptic number.

It is an amenable number.

660666532 is a deficient number, since it is larger than the sum of its proper divisors (495499906).

660666532 is a wasteful number, since it uses less digits than its factorization.

660666532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165166637 (or 165166635 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 660666532 is about 25703.4342452521. The cubic root of 660666532 is about 870.9517623927.

The spelling of 660666532 in words is "six hundred sixty million, six hundred sixty-six thousand, five hundred thirty-two".