65291247521 has 8 divisors (see below), whose sum is σ = 65930502144. Its totient is φ = 64652096160.

The previous prime is 65291247499. The next prime is 65291247529. The reversal of 65291247521 is 12574219256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65291247521 - 2⁶ = 65291247457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65291247529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074976 + ... + 2106206.

It is an arithmetic number, because the mean of its divisors is an integer number (8241312768).

Almost surely, 2^65291247521 is an apocalyptic number.

It is an amenable number.

65291247521 is a deficient number, since it is larger than the sum of its proper divisors (639254623).

65291247521 is a wasteful number, since it uses less digits than its factorization.

65291247521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51631.

The product of its digits is 302400, while the sum is 44.

The spelling of 65291247521 in words is "sixty-five billion, two hundred ninety-one million, two hundred forty-seven thousand, five hundred twenty-one".