6687521268 has 36 divisors (see below), whose sum is σ = 16576113792. Its totient is φ = 2098044800.

The previous prime is 6687521263. The next prime is 6687521339. The reversal of 6687521268 is 8621257866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 6687521268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687521263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 960708 + ... + 967643.

Almost surely, 2^6687521268 is an apocalyptic number.

6687521268 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

6687521268 is an abundant number, since it is smaller than the sum of its proper divisors (9888592524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687521268 is a wasteful number, since it uses less digits than its factorization.

6687521268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928392 (or 1928373 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 6687521268 is about 81777.2662052236. The cubic root of 6687521268 is about 1884.0325080827.

The spelling of 6687521268 in words is "six billion, six hundred eighty-seven million, five hundred twenty-one thousand, two hundred sixty-eight".