25721012430505 has 8 divisors (see below), whose sum is σ = 35274531333312. Its totient is φ = 17637265666608.

The previous prime is 25721012430473. The next prime is 25721012430523. The reversal of 25721012430505 is 50503421012752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25721012430505 - 2⁵ = 25721012430473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367443034687 + ... + 367443034756.

It is an arithmetic number, because the mean of its divisors is an integer number (4409316416664).

Almost surely, 2^{25721012430505} is an apocalyptic number.

It is an amenable number.

25721012430505 is a deficient number, since it is larger than the sum of its proper divisors (9553518902807).

25721012430505 is an equidigital number, since it uses as much as digits as its factorization.

25721012430505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734886069455.

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 25721012430505 in words is "twenty-five trillion, seven hundred twenty-one billion, twelve million, four hundred thirty thousand, five hundred five".