1256646213664 has 24 divisors (see below), whose sum is σ = 2481030817020. Its totient is φ = 626543149056.

The previous prime is 1256646213577. The next prime is 1256646213743. The reversal of 1256646213664 is 4663126466521.

It can be written as a sum of positive squares in 2 ways, for example, as 1251060146064 + 5586067600 = 1118508^2 + 74740^2 .

It is a super-3 number, since 3×1256646213664³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55612209 + ... + 55634800.

Almost surely, 2^{1256646213664} is an apocalyptic number.

It is an amenable number.

1256646213664 is a deficient number, since it is larger than the sum of its proper divisors (1224384603356).

1256646213664 is a wasteful number, since it uses less digits than its factorization.

1256646213664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111247372 (or 111247364 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 52.

The spelling of 1256646213664 in words is "one trillion, two hundred fifty-six billion, six hundred forty-six million, two hundred thirteen thousand, six hundred sixty-four".