65351660521 has 8 divisors (see below), whose sum is σ = 74691154944. Its totient is φ = 56013051840.

The previous prime is 65351660513. The next prime is 65351660551. The reversal of 65351660521 is 12506615356.

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 65351660521 - 2³ = 65351660513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65351660551) 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, 54985 + ... + 365686.

It is an arithmetic number, because the mean of its divisors is an integer number (9336394368).

Almost surely, 2^65351660521 is an apocalyptic number.

It is an amenable number.

65351660521 is a deficient number, since it is larger than the sum of its proper divisors (9339494423).

65351660521 is a wasteful number, since it uses less digits than its factorization.

65351660521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442871.

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

The spelling of 65351660521 in words is "sixty-five billion, three hundred fifty-one million, six hundred sixty thousand, five hundred twenty-one".