15448979681 has 2 divisors, whose sum is σ = 15448979682. Its totient is φ = 15448979680.

The previous prime is 15448979627. The next prime is 15448979683. The reversal of 15448979681 is 18697984451.

15448979681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14784371281 + 664608400 = 121591^2 + 25780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15448979681 is a prime.

It is a super-2 number, since 2×15448979681² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 15448979683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15448979683) 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 as a sum of consecutive naturals, namely, 7724489840 + 7724489841.

It is an arithmetic number, because the mean of its divisors is an integer number (7724489841).

Almost surely, 2^15448979681 is an apocalyptic number.

It is an amenable number.

15448979681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15448979681 is an equidigital number, since it uses as much as digits as its factorization.

15448979681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 62.

The spelling of 15448979681 in words is "fifteen billion, four hundred forty-eight million, nine hundred seventy-nine thousand, six hundred eighty-one".