6719688621 has 6 divisors (see below), whose sum is σ = 9706216910. Its totient is φ = 4479792408.

The previous prime is 6719688551. The next prime is 6719688631. The reversal of 6719688621 is 1268869176.

6719688621 is a `hidden beast` number, since 6 + 7 + 1 + 9 + 6 + 8 + 8 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5766731721 + 952956900 = 75939^2 + 30870^2 .

It is not a de Polignac number, because 6719688621 - 2⁹ = 6719688109 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 (6719688631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 373316026 + ... + 373316043.

Almost surely, 2^6719688621 is an apocalyptic number.

It is an amenable number.

6719688621 is a deficient number, since it is larger than the sum of its proper divisors (2986528289).

6719688621 is a wasteful number, since it uses less digits than its factorization.

6719688621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746632075 (or 746632072 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 6719688621 is about 81973.7068882456. The cubic root of 6719688621 is about 1887.0484450329.

The spelling of 6719688621 in words is "six billion, seven hundred nineteen million, six hundred eighty-eight thousand, six hundred twenty-one".