6600719421 has 12 divisors (see below), whose sum is σ = 10095218172. Its totient is φ = 4141627776.

The previous prime is 6600719417. The next prime is 6600719471. The reversal of 6600719421 is 1249170066.

6600719421 is a `hidden beast` number, since 6 + 600 + 7 + 1 + 9 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3075922521 + 3524796900 = 55461^2 + 59370^2 .

It is not a de Polignac number, because 6600719421 - 2² = 6600719417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6600719471) 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, 21570826 + ... + 21571131.

It is an arithmetic number, because the mean of its divisors is an integer number (841268181).

Almost surely, 2^6600719421 is an apocalyptic number.

It is an amenable number.

6600719421 is a deficient number, since it is larger than the sum of its proper divisors (3494498751).

6600719421 is a wasteful number, since it uses less digits than its factorization.

6600719421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43141980 (or 43141977 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 6600719421 is about 81244.8116558836. The cubic root of 6600719421 is about 1875.8456081277.

Adding to 6600719421 its reverse (1249170066), we get a palindrome (7849889487).

The spelling of 6600719421 in words is "six billion, six hundred million, seven hundred nineteen thousand, four hundred twenty-one".