1008888785521 has 2 divisors, whose sum is σ = 1008888785522. Its totient is φ = 1008888785520.

The previous prime is 1008888785477. The next prime is 1008888785549. The reversal of 1008888785521 is 1255878888001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991030205025 + 17858580496 = 995505^2 + 133636^2 .

It is an emirp because it is prime and its reverse (1255878888001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1008888785521 - 2¹⁹ = 1008888261233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1008888785521.

It is not a weakly prime, because it can be changed into another prime (1008888785551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504444392760 + 504444392761.

It is an arithmetic number, because the mean of its divisors is an integer number (504444392761).

Almost surely, 2^{1008888785521} is an apocalyptic number.

It is an amenable number.

1008888785521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1008888785521 is an equidigital number, since it uses as much as digits as its factorization.

1008888785521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11468800, while the sum is 61.

The spelling of 1008888785521 in words is "one trillion, eight billion, eight hundred eighty-eight million, seven hundred eighty-five thousand, five hundred twenty-one".