664102726523 has 16 divisors (see below), whose sum is σ = 680005747680. Its totient is φ = 648363744000.

The previous prime is 664102726499. The next prime is 664102726537. The reversal of 664102726523 is 325627201466.

It is a cyclic number.

It is not a de Polignac number, because 664102726523 - 2¹⁰ = 664102725499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664102726423) 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, 56269223 + ... + 56281023.

It is an arithmetic number, because the mean of its divisors is an integer number (42500359230).

Almost surely, 2^664102726523 is an apocalyptic number.

664102726523 is a deficient number, since it is larger than the sum of its proper divisors (15903021157).

664102726523 is a wasteful number, since it uses less digits than its factorization.

664102726523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18638.

The product of its (nonzero) digits is 725760, while the sum is 44.

Adding to 664102726523 its reverse (325627201466), we get a palindrome (989729927989).

The spelling of 664102726523 in words is "six hundred sixty-four billion, one hundred two million, seven hundred twenty-six thousand, five hundred twenty-three".