6540400079 has 2 divisors, whose sum is σ = 6540400080. Its totient is φ = 6540400078.

The previous prime is 6540399997. The next prime is 6540400091. The reversal of 6540400079 is 9700040456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6540400079 - 2¹⁶ = 6540334543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6540400379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270200039 + 3270200040.

It is an arithmetic number, because the mean of its divisors is an integer number (3270200040).

Almost surely, 2^6540400079 is an apocalyptic number.

6540400079 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540400079 is an equidigital number, since it uses as much as digits as its factorization.

6540400079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 6540400079 is about 80872.7400240650. The cubic root of 6540400079 is about 1870.1141016291.

The spelling of 6540400079 in words is "six billion, five hundred forty million, four hundred thousand, seventy-nine".