25420451500505 has 16 divisors (see below), whose sum is σ = 30903238713600. Its totient is φ = 20070772650240.

The previous prime is 25420451500459. The next prime is 25420451500571. The reversal of 25420451500505 is 50500515402452.

It is not a de Polignac number, because 25420451500505 - 2⁶ = 25420451500441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12114416 + ... + 14057025.

It is an arithmetic number, because the mean of its divisors is an integer number (1931452419600).

Almost surely, 2^{25420451500505} is an apocalyptic number.

It is an amenable number.

25420451500505 is a deficient number, since it is larger than the sum of its proper divisors (5482787213095).

25420451500505 is a wasteful number, since it uses less digits than its factorization.

25420451500505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26173984.

The product of its (nonzero) digits is 200000, while the sum is 38.

Adding to 25420451500505 its reverse (50500515402452), we get a palindrome (75920966902957).

The spelling of 25420451500505 in words is "twenty-five trillion, four hundred twenty billion, four hundred fifty-one million, five hundred thousand, five hundred five".