665145434 has 16 divisors (see below), whose sum is σ = 1058389416. Its totient is φ = 312422400.

The previous prime is 665145427. The next prime is 665145443. The reversal of 665145434 is 434541566.

It can be written as a sum of positive squares in 4 ways, for example, as 652649209 + 12496225 = 25547^2 + 3535^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314 + ... + 36474.

Almost surely, 2^665145434 is an apocalyptic number.

665145434 is a deficient number, since it is larger than the sum of its proper divisors (393243982).

665145434 is a wasteful number, since it uses less digits than its factorization.

665145434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36721.

The product of its digits is 172800, while the sum is 38.

The square root of 665145434 is about 25790.4136066097. The cubic root of 665145434 is about 872.9154991259.

The spelling of 665145434 in words is "six hundred sixty-five million, one hundred forty-five thousand, four hundred thirty-four".