64665635 has 4 divisors (see below), whose sum is σ = 77598768. Its totient is φ = 51732504.

The previous prime is 64665619. The next prime is 64665649. The reversal of 64665635 is 53656646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64665635 - 2⁴ = 64665619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64665592 and 64665601.

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, 6466559 + ... + 6466568.

It is an arithmetic number, because the mean of its divisors is an integer number (19399692).

Almost surely, 2^64665635 is an apocalyptic number.

64665635 is a deficient number, since it is larger than the sum of its proper divisors (12933133).

64665635 is a wasteful number, since it uses less digits than its factorization.

64665635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12933132.

The product of its digits is 388800, while the sum is 41.

The square root of 64665635 is about 8041.4945750153. The cubic root of 64665635 is about 401.3819595543.

The spelling of 64665635 in words is "sixty-four million, six hundred sixty-five thousand, six hundred thirty-five".