25920415981 has 8 divisors (see below), whose sum is σ = 27057196800. Its totient is φ = 24802425120.

The previous prime is 25920415957. The next prime is 25920416023. The reversal of 25920415981 is 18951402952.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25920415981 - 2¹⁵ = 25920383213 is a prime.

It is a super-2 number, since 2×25920415981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25920415921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4694671 + ... + 4700188.

It is an arithmetic number, because the mean of its divisors is an integer number (3382149600).

Almost surely, 2^25920415981 is an apocalyptic number.

It is an amenable number.

25920415981 is a deficient number, since it is larger than the sum of its proper divisors (1136780819).

25920415981 is an equidigital number, since it uses as much as digits as its factorization.

25920415981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394979.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 25920415981 in words is "twenty-five billion, nine hundred twenty million, four hundred fifteen thousand, nine hundred eighty-one".