65649505 has 4 divisors (see below), whose sum is σ = 78779412. Its totient is φ = 52519600.

The previous prime is 65649469. The next prime is 65649509. The reversal of 65649505 is 50594656.

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 38651089 + 26998416 = 6217^2 + 5196^2 .

It is not a de Polignac number, because 65649505 - 2¹⁷ = 65518433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65649509) 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, 6564946 + ... + 6564955.

It is an arithmetic number, because the mean of its divisors is an integer number (19694853).

Almost surely, 2^65649505 is an apocalyptic number.

It is an amenable number.

65649505 is a deficient number, since it is larger than the sum of its proper divisors (13129907).

65649505 is a wasteful number, since it uses less digits than its factorization.

65649505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13129906.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 65649505 is about 8102.4382132788. The cubic root of 65649505 is about 403.4073610602.

The spelling of 65649505 in words is "sixty-five million, six hundred forty-nine thousand, five hundred five".