25778450481 has 8 divisors (see below), whose sum is σ = 39281448384. Its totient is φ = 14730543120.

The previous prime is 25778450459. The next prime is 25778450491. The reversal of 25778450481 is 18405487752.

It is a happy number.

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

It is not a de Polignac number, because 25778450481 - 2⁷ = 25778450353 is a prime.

It is a super-2 number, since 2×25778450481² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25778450491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613772610 + ... + 613772651.

It is an arithmetic number, because the mean of its divisors is an integer number (4910181048).

Almost surely, 2^25778450481 is an apocalyptic number.

25778450481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25778450481 is a deficient number, since it is larger than the sum of its proper divisors (13502997903).

25778450481 is a wasteful number, since it uses less digits than its factorization.

25778450481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227545271.

The product of its (nonzero) digits is 2508800, while the sum is 51.

The spelling of 25778450481 in words is "twenty-five billion, seven hundred seventy-eight million, four hundred fifty thousand, four hundred eighty-one".