7538536561 has 2 divisors, whose sum is σ = 7538536562. Its totient is φ = 7538536560.

The previous prime is 7538536553. The next prime is 7538536601. The reversal of 7538536561 is 1656358357.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5753981025 + 1784555536 = 75855^2 + 42244^2 .

It is an emirp because it is prime and its reverse (1656358357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7538536561 - 2³ = 7538536553 is a prime.

It is not a weakly prime, because it can be changed into another prime (7538536361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3769268280 + 3769268281.

It is an arithmetic number, because the mean of its divisors is an integer number (3769268281).

Almost surely, 2^7538536561 is an apocalyptic number.

It is an amenable number.

7538536561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7538536561 is an equidigital number, since it uses as much as digits as its factorization.

7538536561 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 7538536561 is about 86824.7462478296. The cubic root of 7538536561 is about 1960.7806623156.

The spelling of 7538536561 in words is "seven billion, five hundred thirty-eight million, five hundred thirty-six thousand, five hundred sixty-one".