65615013 has 6 divisors (see below), whose sum is σ = 94777254. Its totient is φ = 43743336.

The previous prime is 65614993. The next prime is 65615041. The reversal of 65615013 is 31051656.

It is a happy number.

65615013 is a `hidden beast` number, since 656 + 1 + 5 + 0 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50381604 + 15233409 = 7098^2 + 3903^2 .

It is not a de Polignac number, because 65615013 - 2¹² = 65610917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65615063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3645270 + ... + 3645287.

It is an arithmetic number, because the mean of its divisors is an integer number (15796209).

Almost surely, 2^65615013 is an apocalyptic number.

It is an amenable number.

65615013 is a deficient number, since it is larger than the sum of its proper divisors (29162241).

65615013 is a wasteful number, since it uses less digits than its factorization.

65615013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290563 (or 7290560 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 65615013 is about 8100.3094385338. The cubic root of 65615013 is about 403.3366991197.

Adding to 65615013 its reverse (31051656), we get a palindrome (96666669).

The spelling of 65615013 in words is "sixty-five million, six hundred fifteen thousand, thirteen".