6782988521 has 2 divisors, whose sum is σ = 6782988522. Its totient is φ = 6782988520.

The previous prime is 6782988493. The next prime is 6782988533. The reversal of 6782988521 is 1258892876.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5785123600 + 997864921 = 76060^2 + 31589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6782988521 is a prime.

It is not a weakly prime, because it can be changed into another prime (6782988551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3391494260 + 3391494261.

It is an arithmetic number, because the mean of its divisors is an integer number (3391494261).

Almost surely, 2^6782988521 is an apocalyptic number.

It is an amenable number.

6782988521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6782988521 is an equidigital number, since it uses as much as digits as its factorization.

6782988521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 56.

The square root of 6782988521 is about 82358.9006786759. The cubic root of 6782988521 is about 1892.9553086665.

The spelling of 6782988521 in words is "six billion, seven hundred eighty-two million, nine hundred eighty-eight thousand, five hundred twenty-one".