665533706 has 4 divisors (see below), whose sum is σ = 998300562. Its totient is φ = 332766852.

The previous prime is 665533669. The next prime is 665533709. The reversal of 665533706 is 607335566.

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., 508908481 + 156625225 = 22559^2 + 12515^2 .

It is a super-2 number, since 2×665533706² = 885870227644188872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665533709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166383425 + ... + 166383428.

Almost surely, 2^665533706 is an apocalyptic number.

665533706 is a deficient number, since it is larger than the sum of its proper divisors (332766856).

665533706 is a wasteful number, since it uses less digits than its factorization.

665533706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332766855.

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 665533706 is about 25797.9399565159. The cubic root of 665533706 is about 873.0853179865.

The spelling of 665533706 in words is "six hundred sixty-five million, five hundred thirty-three thousand, seven hundred six".