664860307727 has 24 divisors (see below), whose sum is σ = 848888230176. Its totient is φ = 509579928000.

The previous prime is 664860307697. The next prime is 664860307757. The reversal of 664860307727 is 727703068466.

It is an interprime number because it is at equal distance from previous prime (664860307697) and next prime (664860307757).

It is not a de Polignac number, because 664860307727 - 2⁶ = 664860307663 is a prime.

It is a super-2 number, since 2×664860307727² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664860307757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6382424 + ... + 6485757.

It is an arithmetic number, because the mean of its divisors is an integer number (35370342924).

Almost surely, 2^664860307727 is an apocalyptic number.

664860307727 is a deficient number, since it is larger than the sum of its proper divisors (184027922449).

664860307727 is a wasteful number, since it uses less digits than its factorization.

664860307727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12868271 (or 12868260 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 56.

The spelling of 664860307727 in words is "six hundred sixty-four billion, eight hundred sixty million, three hundred seven thousand, seven hundred twenty-seven".