15897809853 has 12 divisors (see below), whose sum is σ = 23221521180. Its totient is φ = 10479454656.

The previous prime is 15897809849. The next prime is 15897809897. The reversal of 15897809853 is 35890879851.

It can be written as a sum of positive squares in 2 ways, for example, as 6030764964 + 9867044889 = 77658^2 + 99333^2 .

It is not a de Polignac number, because 15897809853 - 2² = 15897809849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15897809833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9922926 + ... + 9924527.

It is an arithmetic number, because the mean of its divisors is an integer number (1935126765).

Almost surely, 2^15897809853 is an apocalyptic number.

It is an amenable number.

15897809853 is a deficient number, since it is larger than the sum of its proper divisors (7323711327).

15897809853 is a wasteful number, since it uses less digits than its factorization.

15897809853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19847548 (or 19847545 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 63.

The spelling of 15897809853 in words is "fifteen billion, eight hundred ninety-seven million, eight hundred nine thousand, eight hundred fifty-three".