15689132321 has 2 divisors, whose sum is σ = 15689132322. Its totient is φ = 15689132320.

The previous prime is 15689132299. The next prime is 15689132357. The reversal of 15689132321 is 12323198651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10794171025 + 4894961296 = 103895^2 + 69964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15689132321 is a prime.

It is a super-2 number, since 2×15689132321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15689132821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7844566160 + 7844566161.

It is an arithmetic number, because the mean of its divisors is an integer number (7844566161).

Almost surely, 2^15689132321 is an apocalyptic number.

It is an amenable number.

15689132321 is a deficient number, since it is larger than the sum of its proper divisors (1).

15689132321 is an equidigital number, since it uses as much as digits as its factorization.

15689132321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The spelling of 15689132321 in words is "fifteen billion, six hundred eighty-nine million, one hundred thirty-two thousand, three hundred twenty-one".