25778450393 has 16 divisors (see below), whose sum is σ = 28322411520. Its totient is φ = 23353765776.

The previous prime is 25778450363. The next prime is 25778450459. The reversal of 25778450393 is 39305487752.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25778450393 - 2¹⁰ = 25778449369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25778450323) 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 15 ways as a sum of consecutive naturals, for example, 3040346 + ... + 3048812.

It is an arithmetic number, because the mean of its divisors is an integer number (1770150720).

Almost surely, 2^25778450393 is an apocalyptic number.

25778450393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25778450393 is a deficient number, since it is larger than the sum of its proper divisors (2543961127).

25778450393 is a wasteful number, since it uses less digits than its factorization.

25778450393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15476.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 25778450393 in words is "twenty-five billion, seven hundred seventy-eight million, four hundred fifty thousand, three hundred ninety-three".