13865663890 has 16 divisors (see below), whose sum is σ = 26878056408. Its totient is φ = 5119629696.

The previous prime is 13865663887. The next prime is 13865663893. The reversal of 13865663890 is 9836656831.

It is an interprime number because it is at equal distance from previous prime (13865663887) and next prime (13865663893).

It can be written as a sum of positive squares in 4 ways, for example, as 3502627489 + 10363036401 = 59183^2 + 101799^2 .

It is a super-2 number, since 2×13865663890² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13865663893) 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 7 ways as a sum of consecutive naturals, for example, 53329347 + ... + 53329606.

Almost surely, 2^13865663890 is an apocalyptic number.

13865663890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13865663890 is a deficient number, since it is larger than the sum of its proper divisors (13012392518).

13865663890 is a wasteful number, since it uses less digits than its factorization.

13865663890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106658973.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 13865663890 in words is "thirteen billion, eight hundred sixty-five million, six hundred sixty-three thousand, eight hundred ninety".