1025606565521 has 4 divisors (see below), whose sum is σ = 1050621359844. Its totient is φ = 1000591771200.

The previous prime is 1025606565479. The next prime is 1025606565539. The reversal of 1025606565521 is 1255656065201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124777791121 + 900828774400 = 353239^2 + 949120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025606565521 - 2¹⁰ = 1025606564497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025606565421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12507397100 + ... + 12507397181.

It is an arithmetic number, because the mean of its divisors is an integer number (262655339961).

Almost surely, 2^{1025606565521} is an apocalyptic number.

It is an amenable number.

1025606565521 is a deficient number, since it is larger than the sum of its proper divisors (25014794323).

1025606565521 is an equidigital number, since it uses as much as digits as its factorization.

1025606565521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25014794322.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 1025606565521 in words is "one trillion, twenty-five billion, six hundred six million, five hundred sixty-five thousand, five hundred twenty-one".