665961535 has 8 divisors (see below), whose sum is σ = 799402176. Its totient is φ = 532603680.

The previous prime is 665961529. The next prime is 665961559. The reversal of 665961535 is 535169566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-665961535 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351 + ... + 36520.

It is an arithmetic number, because the mean of its divisors is an integer number (99925272).

Almost surely, 2^665961535 is an apocalyptic number.

665961535 is a deficient number, since it is larger than the sum of its proper divisors (133440641).

665961535 is a wasteful number, since it uses less digits than its factorization.

665961535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41393.

The product of its digits is 729000, while the sum is 46.

The square root of 665961535 is about 25806.2305461297. The cubic root of 665961535 is about 873.2723614595.

The spelling of 665961535 in words is "six hundred sixty-five million, nine hundred sixty-one thousand, five hundred thirty-five".