9987551915 has 16 divisors (see below), whose sum is σ = 13076729856. Its totient is φ = 7262498400.

The previous prime is 9987551891. The next prime is 9987551983. The reversal of 9987551915 is 5191557899.

It is not a de Polignac number, because 9987551915 - 2⁸ = 9987551659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475424 + ... + 495986.

It is an arithmetic number, because the mean of its divisors is an integer number (817295616).

Almost surely, 2^9987551915 is an apocalyptic number.

9987551915 is a deficient number, since it is larger than the sum of its proper divisors (3089177941).

9987551915 is a wasteful number, since it uses less digits than its factorization.

9987551915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29410.

The product of its digits is 5103000, while the sum is 59.

The square root of 9987551915 is about 99937.7401935825. The cubic root of 9987551915 is about 2153.5403659702.

Multiplying 9987551915 by its sum of digits (59), we get a palindrome (589265562985).

The spelling of 9987551915 in words is "nine billion, nine hundred eighty-seven million, five hundred fifty-one thousand, nine hundred fifteen".