25401817656385 has 16 divisors (see below), whose sum is σ = 31375862194176. Its totient is φ = 19732475786688.

The previous prime is 25401817656379. The next prime is 25401817656401. The reversal of 25401817656385 is 58365671810452.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25401817656385 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 425532522 + ... + 425592211.

It is an arithmetic number, because the mean of its divisors is an integer number (1960991387136).

Almost surely, 2^{25401817656385} is an apocalyptic number.

It is an amenable number.

25401817656385 is a deficient number, since it is larger than the sum of its proper divisors (5974044537791).

25401817656385 is a wasteful number, since it uses less digits than its factorization.

25401817656385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851124912.

The product of its (nonzero) digits is 48384000, while the sum is 61.

The spelling of 25401817656385 in words is "twenty-five trillion, four hundred one billion, eight hundred seventeen million, six hundred fifty-six thousand, three hundred eighty-five".