15821480897 has 2 divisors, whose sum is σ = 15821480898. Its totient is φ = 15821480896.

The previous prime is 15821480863. The next prime is 15821480921. The reversal of 15821480897 is 79808412851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15385673521 + 435807376 = 124039^2 + 20876^2 .

It is an emirp because it is prime and its reverse (79808412851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15821480897 - 2⁸ = 15821480641 is a prime.

It is not a weakly prime, because it can be changed into another prime (15821480197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7910740448 + 7910740449.

It is an arithmetic number, because the mean of its divisors is an integer number (7910740449).

Almost surely, 2^15821480897 is an apocalyptic number.

It is an amenable number.

15821480897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15821480897 is an equidigital number, since it uses as much as digits as its factorization.

15821480897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 15821480897 in words is "fifteen billion, eight hundred twenty-one million, four hundred eighty thousand, eight hundred ninety-seven".