25551560216505 has 16 divisors (see below), whose sum is σ = 41399996302080. Its totient is φ = 13454998796928.

The previous prime is 25551560216489. The next prime is 25551560216509. The reversal of 25551560216505 is 50561206515552.

It is not a de Polignac number, because 25551560216505 - 2⁴ = 25551560216489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25551560216509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10781247852 + ... + 10781250221.

It is an arithmetic number, because the mean of its divisors is an integer number (2587499768880).

Almost surely, 2^{25551560216505} is an apocalyptic number.

It is an amenable number.

25551560216505 is a deficient number, since it is larger than the sum of its proper divisors (15848436085575).

25551560216505 is a wasteful number, since it uses less digits than its factorization.

25551560216505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21562498160.

The product of its (nonzero) digits is 2250000, while the sum is 48.

The spelling of 25551560216505 in words is "twenty-five trillion, five hundred fifty-one billion, five hundred sixty million, two hundred sixteen thousand, five hundred five".