665434090 has 8 divisors (see below), whose sum is σ = 1197781380. Its totient is φ = 266173632.

The previous prime is 665434067. The next prime is 665434097. The reversal of 665434090 is 90434566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 544895649 + 120538441 = 23343^2 + 10979^2 .

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 (665434097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33271695 + ... + 33271714.

Almost surely, 2^665434090 is an apocalyptic number.

665434090 is a deficient number, since it is larger than the sum of its proper divisors (532347290).

665434090 is a wasteful number, since it uses less digits than its factorization.

665434090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66543416.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 665434090 is about 25796.0091874693. The cubic root of 665434090 is about 873.0417551507.

The spelling of 665434090 in words is "six hundred sixty-five million, four hundred thirty-four thousand, ninety".