665107643 has 8 divisors (see below), whose sum is σ = 704566512. Its totient is φ = 625686016.

The previous prime is 665107637. The next prime is 665107661. The reversal of 665107643 is 346701566.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665107643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665107597 and 665107606.

It is not an unprimeable number, because it can be changed into a prime (665107843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32996 + ... + 49182.

It is an arithmetic number, because the mean of its divisors is an integer number (88070814).

Almost surely, 2^665107643 is an apocalyptic number.

665107643 is a deficient number, since it is larger than the sum of its proper divisors (39458869).

665107643 is a wasteful number, since it uses less digits than its factorization.

665107643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18621.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 665107643 is about 25789.6809402521. The cubic root of 665107643 is about 872.8989669147.

The spelling of 665107643 in words is "six hundred sixty-five million, one hundred seven thousand, six hundred forty-three".