15821480871 has 64 divisors (see below), whose sum is σ = 27433728000. Its totient is φ = 8824578048.

The previous prime is 15821480863. The next prime is 15821480897. The reversal of 15821480871 is 17808412851.

15821480871 is a `hidden beast` number, since 15 + 82 + 1 + 480 + 87 + 1 = 666.

It is not a de Polignac number, because 15821480871 - 2³ = 15821480863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15821480821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1989415 + ... + 1997351.

It is an arithmetic number, because the mean of its divisors is an integer number (428652000).

Almost surely, 2^15821480871 is an apocalyptic number.

15821480871 is a deficient number, since it is larger than the sum of its proper divisors (11612247129).

15821480871 is a wasteful number, since it uses less digits than its factorization.

15821480871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205 (or 8199 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 15821480871 in words is "fifteen billion, eight hundred twenty-one million, four hundred eighty thousand, eight hundred seventy-one".