14006506781 has 4 divisors (see below), whose sum is σ = 14017459200. Its totient is φ = 13995554364.

The previous prime is 14006506777. The next prime is 14006506859. The reversal of 14006506781 is 18760560041.

14006506781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 14006506781 - 2² = 14006506777 is a prime.

It is a super-2 number, since 2×14006506781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14006506711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5474291 + ... + 5476848.

It is an arithmetic number, because the mean of its divisors is an integer number (3504364800).

Almost surely, 2^14006506781 is an apocalyptic number.

It is an amenable number.

14006506781 is a deficient number, since it is larger than the sum of its proper divisors (10952419).

14006506781 is a wasteful number, since it uses less digits than its factorization.

14006506781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952418.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 14006506781 in words is "fourteen billion, six million, five hundred six thousand, seven hundred eighty-one".