665978935 has 8 divisors (see below), whose sum is σ = 810431136. Its totient is φ = 525278880.

The previous prime is 665978879. The next prime is 665978953. The reversal of 665978935 is 539879566.

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

It is not a de Polignac number, because 665978935 - 2¹³ = 665970743 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 665978935.

It is a congruent number.

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, 937644 + ... + 938353.

It is an arithmetic number, because the mean of its divisors is an integer number (101303892).

Almost surely, 2^665978935 is an apocalyptic number.

665978935 is a deficient number, since it is larger than the sum of its proper divisors (144452201).

665978935 is a wasteful number, since it uses less digits than its factorization.

665978935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876073.

The product of its digits is 12247200, while the sum is 58.

The square root of 665978935 is about 25806.5676718156. The cubic root of 665978935 is about 873.2799669072.

The spelling of 665978935 in words is "six hundred sixty-five million, nine hundred seventy-eight thousand, nine hundred thirty-five".