25506391564545 has 64 divisors (see below), whose sum is σ = 44735498346240. Its totient is φ = 12352138444800.

The previous prime is 25506391564513. The next prime is 25506391564559. The reversal of 25506391564545 is 54546519360552.

It is not a de Polignac number, because 25506391564545 - 2⁵ = 25506391564513 is a prime.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 8211105 + ... + 10882785.

It is an arithmetic number, because the mean of its divisors is an integer number (698992161660).

Almost surely, 2^{25506391564545} is an apocalyptic number.

It is an amenable number.

25506391564545 is a deficient number, since it is larger than the sum of its proper divisors (19229106781695).

25506391564545 is a wasteful number, since it uses less digits than its factorization.

25506391564545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673026.

The product of its (nonzero) digits is 97200000, while the sum is 60.

The spelling of 25506391564545 in words is "twenty-five trillion, five hundred six billion, three hundred ninety-one million, five hundred sixty-four thousand, five hundred forty-five".