665530634 has 8 divisors (see below), whose sum is σ = 1011971460. Its totient is φ = 328206816.

The previous prime is 665530627. The next prime is 665530639. The reversal of 665530634 is 436035566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 644398225 + 21132409 = 25385^2 + 4597^2 .

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

It is not an unprimeable number, because it can be changed into a prime (665530639) 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, 2279069 + ... + 2279360.

Almost surely, 2^665530634 is an apocalyptic number.

665530634 is a deficient number, since it is larger than the sum of its proper divisors (346440826).

665530634 is a wasteful number, since it uses less digits than its factorization.

665530634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558504.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 665530634 is about 25797.8804168094. The cubic root of 665530634 is about 873.0839746425.

The spelling of 665530634 in words is "six hundred sixty-five million, five hundred thirty thousand, six hundred thirty-four".