65398505 has 4 divisors (see below), whose sum is σ = 78478212. Its totient is φ = 52318800.

The previous prime is 65398481. The next prime is 65398519. The reversal of 65398505 is 50589356.

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 31047184 + 34351321 = 5572^2 + 5861^2 .

It is not a de Polignac number, because 65398505 - 2²⁴ = 48621289 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6539846 + ... + 6539855.

It is an arithmetic number, because the mean of its divisors is an integer number (19619553).

Almost surely, 2^65398505 is an apocalyptic number.

It is an amenable number.

65398505 is a deficient number, since it is larger than the sum of its proper divisors (13079707).

65398505 is a wasteful number, since it uses less digits than its factorization.

65398505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13079706.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 65398505 is about 8086.9342151399. The cubic root of 65398505 is about 402.8925840554.

The spelling of 65398505 in words is "sixty-five million, three hundred ninety-eight thousand, five hundred five".