25201281881721 has 64 divisors (see below), whose sum is σ = 37699667066880. Its totient is φ = 14839982576640.

The previous prime is 25201281881701. The next prime is 25201281881731. The reversal of 25201281881721 is 12718818210252.

It is not a de Polignac number, because 25201281881721 - 2⁷ = 25201281881593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25201281881701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3011261425 + ... + 3011269793.

It is an arithmetic number, because the mean of its divisors is an integer number (589057297920).

Almost surely, 2^{25201281881721} is an apocalyptic number.

It is an amenable number.

25201281881721 is a deficient number, since it is larger than the sum of its proper divisors (12498385185159).

25201281881721 is a wasteful number, since it uses less digits than its factorization.

25201281881721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11566.

The product of its (nonzero) digits is 286720, while the sum is 48.

The spelling of 25201281881721 in words is "twenty-five trillion, two hundred one billion, two hundred eighty-one million, eight hundred eighty-one thousand, seven hundred twenty-one".