1440668426815 has 16 divisors (see below), whose sum is σ = 1750766591808. Its totient is φ = 1137958166016.

The previous prime is 1440668426783. The next prime is 1440668426819. The reversal of 1440668426815 is 5186248660441.

It is a cyclic number.

It is not a de Polignac number, because 1440668426815 - 2⁵ = 1440668426783 is a prime.

It is a super-2 number, since 2×1440668426815² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440668426819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3976912 + ... + 4324021.

It is an arithmetic number, because the mean of its divisors is an integer number (109422911988).

Almost surely, 2^{1440668426815} is an apocalyptic number.

1440668426815 is a deficient number, since it is larger than the sum of its proper divisors (310098164993).

1440668426815 is a wasteful number, since it uses less digits than its factorization.

1440668426815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301378.

The product of its (nonzero) digits is 8847360, while the sum is 55.

The spelling of 1440668426815 in words is "one trillion, four hundred forty billion, six hundred sixty-eight million, four hundred twenty-six thousand, eight hundred fifteen".