25803078491 has 2 divisors, whose sum is σ = 25803078492. Its totient is φ = 25803078490.

The previous prime is 25803078487. The next prime is 25803078557. The reversal of 25803078491 is 19487030852.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25803078491 - 2² = 25803078487 is a prime.

It is a super-2 number, since 2×25803078491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25803075491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12901539245 + 12901539246.

It is an arithmetic number, because the mean of its divisors is an integer number (12901539246).

Almost surely, 2^25803078491 is an apocalyptic number.

25803078491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25803078491 is an equidigital number, since it uses as much as digits as its factorization.

25803078491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 25803078491 in words is "twenty-five billion, eight hundred three million, seventy-eight thousand, four hundred ninety-one".