5515978687 has 4 divisors (see below), whose sum is σ = 5518935016. Its totient is φ = 5513022360.

The previous prime is 5515978679. The next prime is 5515978697. The reversal of 5515978687 is 7868795155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5515978687 - 2³ = 5515978679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5515978697) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1475364 + ... + 1479097.

It is an arithmetic number, because the mean of its divisors is an integer number (1379733754).

Almost surely, 2^5515978687 is an apocalyptic number.

5515978687 is a deficient number, since it is larger than the sum of its proper divisors (2956329).

5515978687 is a wasteful number, since it uses less digits than its factorization.

5515978687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956328.

The product of its digits is 21168000, while the sum is 61.

The square root of 5515978687 is about 74269.6350267052. The cubic root of 5515978687 is about 1766.8819189051.

The spelling of 5515978687 in words is "five billion, five hundred fifteen million, nine hundred seventy-eight thousand, six hundred eighty-seven".