25721125428545 has 32 divisors (see below), whose sum is σ = 31974049624320. Its totient is φ = 19839752674560.

The previous prime is 25721125428521. The next prime is 25721125428623. The reversal of 25721125428545 is 54582452112752.

It is a happy number.

It is not a de Polignac number, because 25721125428545 - 2²² = 25721121234241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 490919300 + ... + 490971690.

It is an arithmetic number, because the mean of its divisors is an integer number (999189050760).

Almost surely, 2^{25721125428545} is an apocalyptic number.

It is an amenable number.

25721125428545 is a deficient number, since it is larger than the sum of its proper divisors (6252924195775).

25721125428545 is a wasteful number, since it uses less digits than its factorization.

25721125428545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57065.

The product of its digits is 8960000, while the sum is 53.

The spelling of 25721125428545 in words is "twenty-five trillion, seven hundred twenty-one billion, one hundred twenty-five million, four hundred twenty-eight thousand, five hundred forty-five".