2642720557 has 2 divisors, whose sum is σ = 2642720558. Its totient is φ = 2642720556.

The previous prime is 2642720551. The next prime is 2642720623. The reversal of 2642720557 is 7550272462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2316881956 + 325838601 = 48134^2 + 18051^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642720557 - 2¹⁹ = 2642196269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2642720551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321360278 + 1321360279.

It is an arithmetic number, because the mean of its divisors is an integer number (1321360279).

Almost surely, 2^2642720557 is an apocalyptic number.

It is an amenable number.

2642720557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2642720557 is an equidigital number, since it uses as much as digits as its factorization.

2642720557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 2642720557 is about 51407.3978820169. The cubic root of 2642720557 is about 1382.5592355484.

The spelling of 2642720557 in words is "two billion, six hundred forty-two million, seven hundred twenty thousand, five hundred fifty-seven".