6688578461 has 2 divisors, whose sum is σ = 6688578462. Its totient is φ = 6688578460.

The previous prime is 6688578451. The next prime is 6688578511. The reversal of 6688578461 is 1648758866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6335364025 + 353214436 = 79595^2 + 18794^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688578461 - 2¹⁰ = 6688577437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6688578461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6688578401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344289230 + 3344289231.

It is an arithmetic number, because the mean of its divisors is an integer number (3344289231).

Almost surely, 2^6688578461 is an apocalyptic number.

It is an amenable number.

6688578461 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688578461 is an equidigital number, since it uses as much as digits as its factorization.

6688578461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 59.

The square root of 6688578461 is about 81783.7298061173. The cubic root of 6688578461 is about 1884.1317815878.

The spelling of 6688578461 in words is "six billion, six hundred eighty-eight million, five hundred seventy-eight thousand, four hundred sixty-one".