6687451887 has 4 divisors (see below), whose sum is σ = 8916602520. Its totient is φ = 4458301256.

The previous prime is 6687451853. The next prime is 6687451889. The reversal of 6687451887 is 7881547866.

It is a happy number.

6687451887 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6687451887 - 2¹² = 6687447791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6687451887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687451889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114575312 + ... + 1114575317.

It is an arithmetic number, because the mean of its divisors is an integer number (2229150630).

Almost surely, 2^6687451887 is an apocalyptic number.

6687451887 is a deficient number, since it is larger than the sum of its proper divisors (2229150633).

6687451887 is a wasteful number, since it uses less digits than its factorization.

6687451887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229150632.

The product of its digits is 18063360, while the sum is 60.

The square root of 6687451887 is about 81776.8419969859. The cubic root of 6687451887 is about 1884.0259926386.

The spelling of 6687451887 in words is "six billion, six hundred eighty-seven million, four hundred fifty-one thousand, eight hundred eighty-seven".