7555087729561 has 2 divisors, whose sum is σ = 7555087729562. Its totient is φ = 7555087729560.

The previous prime is 7555087729559. The next prime is 7555087729571. The reversal of 7555087729561 is 1659277805557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7512669855625 + 42417873936 = 2740925^2 + 205956^2 .

It is a cyclic number.

It is not a de Polignac number, because 7555087729561 - 2¹ = 7555087729559 is a prime.

Together with 7555087729559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7555087729571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3777543864780 + 3777543864781.

It is an arithmetic number, because the mean of its divisors is an integer number (3777543864781).

Almost surely, 2^{7555087729561} is an apocalyptic number.

It is an amenable number.

7555087729561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7555087729561 is an equidigital number, since it uses as much as digits as its factorization.

7555087729561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220000, while the sum is 67.

The spelling of 7555087729561 in words is "seven trillion, five hundred fifty-five billion, eighty-seven million, seven hundred twenty-nine thousand, five hundred sixty-one".