6689689651 has 32 divisors (see below), whose sum is σ = 7412152320. Its totient is φ = 6014736000.

The previous prime is 6689689649. The next prime is 6689689661. The reversal of 6689689651 is 1569869866.

It is a cyclic number.

It is not a de Polignac number, because 6689689651 - 2¹ = 6689689649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6689689631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5040550 + ... + 5041876.

It is an arithmetic number, because the mean of its divisors is an integer number (231629760).

Almost surely, 2^6689689651 is an apocalyptic number.

6689689651 is a deficient number, since it is larger than the sum of its proper divisors (722462669).

6689689651 is a wasteful number, since it uses less digits than its factorization.

6689689651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555.

The product of its digits is 33592320, while the sum is 64.

The square root of 6689689651 is about 81790.5229901362. The cubic root of 6689689651 is about 1884.2361142936.

The spelling of 6689689651 in words is "six billion, six hundred eighty-nine million, six hundred eighty-nine thousand, six hundred fifty-one".