65140621 has 16 divisors (see below), whose sum is σ = 80464384. Its totient is φ = 51352704.

The previous prime is 65140597. The next prime is 65140627. The reversal of 65140621 is 12604156.

It is not a de Polignac number, because 65140621 - 2²³ = 56752013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65140627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27340 + ... + 29626.

It is an arithmetic number, because the mean of its divisors is an integer number (5029024).

Almost surely, 2^65140621 is an apocalyptic number.

It is an amenable number.

65140621 is a deficient number, since it is larger than the sum of its proper divisors (15323763).

65140621 is a wasteful number, since it uses less digits than its factorization.

65140621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 65140621 is about 8070.9739808774. The cubic root of 65140621 is about 402.3623149556.

Adding to 65140621 its reverse (12604156), we get a palindrome (77744777).

The spelling of 65140621 in words is "sixty-five million, one hundred forty thousand, six hundred twenty-one".