14646439681 has 4 divisors (see below), whose sum is σ = 14693233732. Its totient is φ = 14599645632.

The previous prime is 14646439657. The next prime is 14646439723. The reversal of 14646439681 is 18693464641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18693464641 = 29 ⋅644602229.

It can be written as a sum of positive squares in 2 ways, for example, as 154132225 + 14492307456 = 12415^2 + 120384^2 .

It is a cyclic number.

It is not a de Polignac number, because 14646439681 - 2¹¹ = 14646437633 is a prime.

It is a super-2 number, since 2×14646439681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14646439651) 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, 23396556 + ... + 23397181.

It is an arithmetic number, because the mean of its divisors is an integer number (3673308433).

Almost surely, 2^14646439681 is an apocalyptic number.

It is an amenable number.

14646439681 is a deficient number, since it is larger than the sum of its proper divisors (46794051).

14646439681 is an equidigital number, since it uses as much as digits as its factorization.

14646439681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46794050.

The product of its digits is 2985984, while the sum is 52.

The spelling of 14646439681 in words is "fourteen billion, six hundred forty-six million, four hundred thirty-nine thousand, six hundred eighty-one".