68451635521 has 8 divisors (see below), whose sum is σ = 72966435200. Its totient is φ = 64028044080.

The previous prime is 68451635453. The next prime is 68451635573. The reversal of 68451635521 is 12553615486.

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 68451635521 - 2¹¹ = 68451633473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68451635221) 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, 22800510 + ... + 22803511.

It is an arithmetic number, because the mean of its divisors is an integer number (9120804400).

Almost surely, 2^68451635521 is an apocalyptic number.

It is an amenable number.

68451635521 is a deficient number, since it is larger than the sum of its proper divisors (4514799679).

68451635521 is a wasteful number, since it uses less digits than its factorization.

68451635521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45604119.

The product of its digits is 864000, while the sum is 46.

The spelling of 68451635521 in words is "sixty-eight billion, four hundred fifty-one million, six hundred thirty-five thousand, five hundred twenty-one".