6549543157 has 2 divisors, whose sum is σ = 6549543158. Its totient is φ = 6549543156.

The previous prime is 6549543149. The next prime is 6549543173. The reversal of 6549543157 is 7513459456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4260303441 + 2289239716 = 65271^2 + 47846^2 .

It is a cyclic number.

It is not a de Polignac number, because 6549543157 - 2³ = 6549543149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6549543157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6549543127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3274771578 + 3274771579.

It is an arithmetic number, because the mean of its divisors is an integer number (3274771579).

Almost surely, 2^6549543157 is an apocalyptic number.

It is an amenable number.

6549543157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6549543157 is an equidigital number, since it uses as much as digits as its factorization.

6549543157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268000, while the sum is 49.

The square root of 6549543157 is about 80929.2478464986. The cubic root of 6549543157 is about 1870.9851307955.

The spelling of 6549543157 in words is "six billion, five hundred forty-nine million, five hundred forty-three thousand, one hundred fifty-seven".