664761324469 has 16 divisors (see below), whose sum is σ = 726296097600. Its totient is φ = 603410895360.

The previous prime is 664761324467. The next prime is 664761324551. The reversal of 664761324469 is 964423167466.

It is a cyclic number.

It is not a de Polignac number, because 664761324469 - 2¹ = 664761324467 is a prime.

It is a super-2 number, since 2×664761324469² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664761324467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20988357 + ... + 21020005.

It is an arithmetic number, because the mean of its divisors is an integer number (45393506100).

Almost surely, 2^664761324469 is an apocalyptic number.

It is an amenable number.

664761324469 is a deficient number, since it is larger than the sum of its proper divisors (61534773131).

664761324469 is a wasteful number, since it uses less digits than its factorization.

664761324469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34500.

The product of its digits is 31352832, while the sum is 58.

The spelling of 664761324469 in words is "six hundred sixty-four billion, seven hundred sixty-one million, three hundred twenty-four thousand, four hundred sixty-nine".