11565421625 has 16 divisors (see below), whose sum is σ = 14576569488. Its totient is φ = 9160720000.

The previous prime is 11565421583. The next prime is 11565421643. The reversal of 11565421625 is 52612456511.

It can be written as a sum of positive squares in 8 ways, for example, as 950858896 + 10614562729 = 30836^2 + 103027^2 .

It is not a de Polignac number, because 11565421625 - 2³⁰ = 10491679801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445412 + ... + 470661.

It is an arithmetic number, because the mean of its divisors is an integer number (911035593).

Almost surely, 2^11565421625 is an apocalyptic number.

It is an amenable number.

11565421625 is a deficient number, since it is larger than the sum of its proper divisors (3011147863).

11565421625 is an equidigital number, since it uses as much as digits as its factorization.

11565421625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916189 (or 916179 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The spelling of 11565421625 in words is "eleven billion, five hundred sixty-five million, four hundred twenty-one thousand, six hundred twenty-five".