64903565 has 4 divisors (see below), whose sum is σ = 77884284. Its totient is φ = 51922848.

The previous prime is 64903549. The next prime is 64903567. The reversal of 64903565 is 56530946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6869641 + 58033924 = 2621^2 + 7618^2 .

It is a cyclic number.

It is not a de Polignac number, because 64903565 - 2⁴ = 64903549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64903567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6490352 + ... + 6490361.

It is an arithmetic number, because the mean of its divisors is an integer number (19471071).

Almost surely, 2^64903565 is an apocalyptic number.

It is an amenable number.

64903565 is a deficient number, since it is larger than the sum of its proper divisors (12980719).

64903565 is a wasteful number, since it uses less digits than its factorization.

64903565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980718.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 64903565 is about 8056.2748835923. The cubic root of 64903565 is about 401.8736370905.

The spelling of 64903565 in words is "sixty-four million, nine hundred three thousand, five hundred sixty-five".