665945435 has 4 divisors (see below), whose sum is σ = 799134528. Its totient is φ = 532756344.

The previous prime is 665945407. The next prime is 665945447. The reversal of 665945435 is 534549566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 534549566 = 2 ⋅267274783.

It is a cyclic number.

It is not a de Polignac number, because 665945435 - 2¹⁶ = 665879899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665945435.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66594539 + ... + 66594548.

It is an arithmetic number, because the mean of its divisors is an integer number (199783632).

Almost surely, 2^665945435 is an apocalyptic number.

665945435 is a deficient number, since it is larger than the sum of its proper divisors (133189093).

665945435 is a wasteful number, since it uses less digits than its factorization.

665945435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133189092.

The product of its digits is 1944000, while the sum is 47.

The square root of 665945435 is about 25805.9186040722. The cubic root of 665945435 is about 873.2653241170.

The spelling of 665945435 in words is "six hundred sixty-five million, nine hundred forty-five thousand, four hundred thirty-five".