665038135 has 4 divisors (see below), whose sum is σ = 798045768. Its totient is φ = 532030504.

The previous prime is 665038097. The next prime is 665038151. The reversal of 665038135 is 531830566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531830566 = 2 ⋅265915283.

It is a cyclic number.

It is not a de Polignac number, because 665038135 - 2¹⁷ = 664907063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665038094 and 665038103.

It is a congruent number.

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, 66503809 + ... + 66503818.

It is an arithmetic number, because the mean of its divisors is an integer number (199511442).

Almost surely, 2^665038135 is an apocalyptic number.

665038135 is a deficient number, since it is larger than the sum of its proper divisors (133007633).

665038135 is a wasteful number, since it uses less digits than its factorization.

665038135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133007632.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 665038135 is about 25788.3333117904. Note that the first 4 decimals coincide. The cubic root of 665038135 is about 872.8685580148.

The spelling of 665038135 in words is "six hundred sixty-five million, thirty-eight thousand, one hundred thirty-five".