1145644721056 has 48 divisors (see below), whose sum is σ = 2463210509760. Its totient is φ = 520180807680.

The previous prime is 1145644720999. The next prime is 1145644721057. The reversal of 1145644721056 is 6501274465411.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1145644720997 and 1145644721015.

It is not an unprimeable number, because it can be changed into a prime (1145644721057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447281 + ... + 2094256.

It is an arithmetic number, because the mean of its divisors is an integer number (51316885620).

Almost surely, 2^{1145644721056} is an apocalyptic number.

1145644721056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1145644721056 is an abundant number, since it is smaller than the sum of its proper divisors (1317565788704).

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

1145644721056 is a wasteful number, since it uses less digits than its factorization.

1145644721056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542477 (or 3542469 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 1145644721056 in words is "one trillion, one hundred forty-five billion, six hundred forty-four million, seven hundred twenty-one thousand, fifty-six".