664581732862 has 48 divisors (see below), whose sum is σ = 1043198442000. Its totient is φ = 317494598400.

The previous prime is 664581732823. The next prime is 664581732923. The reversal of 664581732862 is 268237185466.

It is a super-2 number, since 2×664581732862² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a junction number, because it is equal to n+sod(n) for n = 664581732797 and 664581732806.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 192686514 + ... + 192689962.

It is an arithmetic number, because the mean of its divisors is an integer number (21733300875).

Almost surely, 2^664581732862 is an apocalyptic number.

664581732862 is a deficient number, since it is larger than the sum of its proper divisors (378616709138).

664581732862 is a wasteful number, since it uses less digits than its factorization.

664581732862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4669 (or 4640 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 58.

The spelling of 664581732862 in words is "six hundred sixty-four billion, five hundred eighty-one million, seven hundred thirty-two thousand, eight hundred sixty-two".