65616505 has 4 divisors (see below), whose sum is σ = 78739812. Its totient is φ = 52493200.

The previous prime is 65616497. The next prime is 65616547. The reversal of 65616505 is 50561656.

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 21566736 + 44049769 = 4644^2 + 6637^2 .

It is not a de Polignac number, because 65616505 - 2³ = 65616497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

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, 6561646 + ... + 6561655.

It is an arithmetic number, because the mean of its divisors is an integer number (19684953).

Almost surely, 2^65616505 is an apocalyptic number.

It is an amenable number.

65616505 is a deficient number, since it is larger than the sum of its proper divisors (13123307).

65616505 is a wasteful number, since it uses less digits than its factorization.

65616505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123306.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65616505 is about 8100.4015332575. The cubic root of 65616505 is about 403.3397562137.

It can be divided in two parts, 656 and 16505, that added together give a square (17161 = 131²).

The spelling of 65616505 in words is "sixty-five million, six hundred sixteen thousand, five hundred five".