664841705156 has 12 divisors (see below), whose sum is σ = 1163747353020. Its totient is φ = 332342461440.

The previous prime is 664841705147. The next prime is 664841705159. The reversal of 664841705156 is 651507148466.

It can be written as a sum of positive squares in 2 ways, for example, as 483011100100 + 181830605056 = 694990^2 + 426416^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664841705098 and 664841705107.

It is not an unprimeable number, because it can be changed into a prime (664841705159) 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, 19578701 + ... + 19612628.

It is an arithmetic number, because the mean of its divisors is an integer number (96978946085).

Almost surely, 2^664841705156 is an apocalyptic number.

It is an amenable number.

664841705156 is a deficient number, since it is larger than the sum of its proper divisors (498905647864).

664841705156 is a wasteful number, since it uses less digits than its factorization.

664841705156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39195574 (or 39195572 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 664841705156 in words is "six hundred sixty-four billion, eight hundred forty-one million, seven hundred five thousand, one hundred fifty-six".