1440686805881 has 4 divisors (see below), whose sum is σ = 1460422241652. Its totient is φ = 1420951370112.

The previous prime is 1440686805869. The next prime is 1440686805893. The reversal of 1440686805881 is 1885086860441.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1440686805869) and next prime (1440686805893).

It can be written as a sum of positive squares in 2 ways, for example, as 1220894613481 + 219792192400 = 1104941^2 + 468820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440686805881 is a prime.

It is a super-2 number, since 2×1440686805881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440686805881.

It is not an unprimeable number, because it can be changed into a prime (1440686885881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9867717776 + ... + 9867717921.

It is an arithmetic number, because the mean of its divisors is an integer number (365105560413).

Almost surely, 2^{1440686805881} is an apocalyptic number.

It is an amenable number.

1440686805881 is a deficient number, since it is larger than the sum of its proper divisors (19735435771).

1440686805881 is an equidigital number, since it uses as much as digits as its factorization.

1440686805881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19735435770.

The product of its (nonzero) digits is 11796480, while the sum is 59.

The spelling of 1440686805881 in words is "one trillion, four hundred forty billion, six hundred eighty-six million, eight hundred five thousand, eight hundred eighty-one".