20565425541 has 8 divisors (see below), whose sum is σ = 27937936800. Its totient is φ = 13451598992.

The previous prime is 20565425479. The next prime is 20565425549. The reversal of 20565425541 is 14552456502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20565425541 - 2⁶ = 20565425477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20565425541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565425549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64670991 + ... + 64671308.

It is an arithmetic number, because the mean of its divisors is an integer number (3492242100).

Almost surely, 2^20565425541 is an apocalyptic number.

It is an amenable number.

20565425541 is a deficient number, since it is larger than the sum of its proper divisors (7372511259).

20565425541 is a wasteful number, since it uses less digits than its factorization.

20565425541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129342355.

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 20565425541 in words is "twenty billion, five hundred sixty-five million, four hundred twenty-five thousand, five hundred forty-one".