665538130 has 8 divisors (see below), whose sum is σ = 1197968652. Its totient is φ = 266215248.

The previous prime is 665538127. The next prime is 665538131. The reversal of 665538130 is 31835566.

It can be written as a sum of positive squares in 2 ways, for example, as 633377889 + 32160241 = 25167^2 + 5671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665538130.

It is not an unprimeable number, because it can be changed into a prime (665538131) 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, 33276897 + ... + 33276916.

Almost surely, 2^665538130 is an apocalyptic number.

665538130 is a deficient number, since it is larger than the sum of its proper divisors (532430522).

665538130 is a wasteful number, since it uses less digits than its factorization.

665538130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66553820.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 665538130 is about 25798.0256996538. The cubic root of 665538130 is about 873.0872525346.

The spelling of 665538130 in words is "six hundred sixty-five million, five hundred thirty-eight thousand, one hundred thirty".