1245056440689 has 20 divisors (see below), whose sum is σ = 1860026161840. Its totient is φ = 829980934200.

The previous prime is 1245056440681. The next prime is 1245056440723. The reversal of 1245056440689 is 9860446505421.

It is a happy number.

1245056440689 is a `hidden beast` number, since 1 + 24 + 50 + 56 + 440 + 6 + 89 = 666.

It is not a de Polignac number, because 1245056440689 - 2³ = 1245056440681 is a prime.

It is a super-2 number, since 2×1245056440689² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245056440681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 685422 + ... + 1720440.

It is an arithmetic number, because the mean of its divisors is an integer number (93001308092).

Almost surely, 2^{1245056440689} is an apocalyptic number.

It is an amenable number.

1245056440689 is a deficient number, since it is larger than the sum of its proper divisors (614969721151).

1245056440689 is a wasteful number, since it uses less digits than its factorization.

1245056440689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049882 (or 1049873 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 1245056440689 in words is "one trillion, two hundred forty-five billion, fifty-six million, four hundred forty thousand, six hundred eighty-nine".