664717424851 has 16 divisors (see below), whose sum is σ = 680648832000. Its totient is φ = 648861756928.

The previous prime is 664717424827. The next prime is 664717424863. The reversal of 664717424851 is 158424717466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664717424851 - 2¹⁵ = 664717392083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664717424792 and 664717424801.

It is not an unprimeable number, because it can be changed into a prime (664717424251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70120530 + ... + 70130008.

It is an arithmetic number, because the mean of its divisors is an integer number (42540552000).

Almost surely, 2^664717424851 is an apocalyptic number.

664717424851 is a deficient number, since it is larger than the sum of its proper divisors (15931407149).

664717424851 is a wasteful number, since it uses less digits than its factorization.

664717424851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298.

The product of its digits is 9031680, while the sum is 55.

The spelling of 664717424851 in words is "six hundred sixty-four billion, seven hundred seventeen million, four hundred twenty-four thousand, eight hundred fifty-one".