664325521747 has 4 divisors (see below), whose sum is σ = 682280265616. Its totient is φ = 646370777880.

The previous prime is 664325521723. The next prime is 664325521781. The reversal of 664325521747 is 747125523466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664325521747 - 2¹⁵ = 664325488979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664325521694 and 664325521703.

It is not an unprimeable number, because it can be changed into a prime (664325521247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8977371879 + ... + 8977371952.

It is an arithmetic number, because the mean of its divisors is an integer number (170570066404).

Almost surely, 2^664325521747 is an apocalyptic number.

664325521747 is a deficient number, since it is larger than the sum of its proper divisors (17954743869).

664325521747 is a wasteful number, since it uses less digits than its factorization.

664325521747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17954743868.

The product of its digits is 8467200, while the sum is 52.

The spelling of 664325521747 in words is "six hundred sixty-four billion, three hundred twenty-five million, five hundred twenty-one thousand, seven hundred forty-seven".