9875665815 has 48 divisors (see below), whose sum is σ = 17214713856. Its totient is φ = 4828766400.

The previous prime is 9875665783. The next prime is 9875665817. The reversal of 9875665815 is 5185665789.

9875665815 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9875665815 - 2⁵ = 9875665783 is a prime.

It is a super-2 number, since 2×9875665815² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9875665817) 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 in 47 ways as a sum of consecutive naturals, for example, 138450 + ... + 197280.

It is an arithmetic number, because the mean of its divisors is an integer number (358639872).

Almost surely, 2^9875665815 is an apocalyptic number.

9875665815 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

9875665815 is a deficient number, since it is larger than the sum of its proper divisors (7339048041).

9875665815 is a wasteful number, since it uses less digits than its factorization.

9875665815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58908 (or 58889 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 60.

The square root of 9875665815 is about 99376.3845941278. The cubic root of 9875665815 is about 2145.4684302509.

The spelling of 9875665815 in words is "nine billion, eight hundred seventy-five million, six hundred sixty-five thousand, eight hundred fifteen".