660530642 has 4 divisors (see below), whose sum is σ = 990795966. Its totient is φ = 330265320.

The previous prime is 660530639. The next prime is 660530669. The reversal of 660530642 is 246035066.

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

It can be written as a sum of positive squares in only one way, i.e., 543869041 + 116661601 = 23321^2 + 10801^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660530599 and 660530608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165132659 + ... + 165132662.

Almost surely, 2^660530642 is an apocalyptic number.

660530642 is a deficient number, since it is larger than the sum of its proper divisors (330265324).

660530642 is a wasteful number, since it uses less digits than its factorization.

660530642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330265323.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 660530642 is about 25700.7906882259. The cubic root of 660530642 is about 870.8920440402.

The spelling of 660530642 in words is "six hundred sixty million, five hundred thirty thousand, six hundred forty-two".