6540807157 has 2 divisors, whose sum is σ = 6540807158. Its totient is φ = 6540807156.

The previous prime is 6540807089. The next prime is 6540807193. The reversal of 6540807157 is 7517080456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5576953041 + 963854116 = 74679^2 + 31046^2 .

It is a cyclic number.

It is not a de Polignac number, because 6540807157 - 2¹¹ = 6540805109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6540807557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270403578 + 3270403579.

It is an arithmetic number, because the mean of its divisors is an integer number (3270403579).

Almost surely, 2^6540807157 is an apocalyptic number.

It is an amenable number.

6540807157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540807157 is an equidigital number, since it uses as much as digits as its factorization.

6540807157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 6540807157 is about 80875.2567662075. The cubic root of 6540807157 is about 1870.1528997916.

The spelling of 6540807157 in words is "six billion, five hundred forty million, eight hundred seven thousand, one hundred fifty-seven".