14646121981 has 16 divisors (see below), whose sum is σ = 15261770160. Its totient is φ = 14038133760.

The previous prime is 14646121969. The next prime is 14646122017. The reversal of 14646121981 is 18912164641.

It can be written as a sum of positive squares in 8 ways, for example, as 4503617881 + 10142504100 = 67109^2 + 100710^2 .

It is a cyclic number.

It is not a de Polignac number, because 14646121981 - 2¹⁹ = 14645597693 is a prime.

It is a super-2 number, since 2×14646121981² (a number of 21 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 (14646121961) 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, 3425461 + ... + 3429733.

It is an arithmetic number, because the mean of its divisors is an integer number (953860635).

Almost surely, 2^14646121981 is an apocalyptic number.

It is an amenable number.

14646121981 is a deficient number, since it is larger than the sum of its proper divisors (615648179).

14646121981 is a wasteful number, since it uses less digits than its factorization.

14646121981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136.

The product of its digits is 82944, while the sum is 43.

The spelling of 14646121981 in words is "fourteen billion, six hundred forty-six million, one hundred twenty-one thousand, nine hundred eighty-one".