65118621 has 4 divisors (see below), whose sum is σ = 86824832. Its totient is φ = 43412412.

The previous prime is 65118611. The next prime is 65118629. The reversal of 65118621 is 12681156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65118621 - 2¹⁰ = 65117597 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 (65118629) 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, 10853101 + ... + 10853106.

It is an arithmetic number, because the mean of its divisors is an integer number (21706208).

Almost surely, 2^65118621 is an apocalyptic number.

It is an amenable number.

65118621 is a deficient number, since it is larger than the sum of its proper divisors (21706211).

65118621 is a wasteful number, since it uses less digits than its factorization.

65118621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21706210.

The product of its digits is 2880, while the sum is 30.

The square root of 65118621 is about 8069.6109571652. The cubic root of 65118621 is about 402.3170131275.

Adding to 65118621 its reverse (12681156), we get a palindrome (77799777).

The spelling of 65118621 in words is "sixty-five million, one hundred eighteen thousand, six hundred twenty-one".