1256643022160 has 40 divisors (see below), whose sum is σ = 2921783860680. Its totient is φ = 502641925632.

The previous prime is 1256643022133. The next prime is 1256643022177. The reversal of 1256643022160 is 612203466521.

It can be written as a sum of positive squares in 4 ways, for example, as 152218583104 + 1104424439056 = 390152^2 + 1050916^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2621606 + ... + 3063674.

It is an arithmetic number, because the mean of its divisors is an integer number (73044596517).

Almost surely, 2^{1256643022160} is an apocalyptic number.

1256643022160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256643022160 is an abundant number, since it is smaller than the sum of its proper divisors (1665140838520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256643022160 is a wasteful number, since it uses less digits than its factorization.

1256643022160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477615 (or 477609 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 1256643022160 its reverse (612203466521), we get a palindrome (1868846488681).

The spelling of 1256643022160 in words is "one trillion, two hundred fifty-six billion, six hundred forty-three million, twenty-two thousand, one hundred sixty".