25503787643 has 2 divisors, whose sum is σ = 25503787644. Its totient is φ = 25503787642.

The previous prime is 25503787607. The next prime is 25503787669. The reversal of 25503787643 is 34678730552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25503787643 - 2¹⁰ = 25503786619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25503787591 and 25503787600.

It is not a weakly prime, because it can be changed into another prime (25503787943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12751893821 + 12751893822.

It is an arithmetic number, because the mean of its divisors is an integer number (12751893822).

Almost surely, 2^25503787643 is an apocalyptic number.

25503787643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25503787643 is an equidigital number, since it uses as much as digits as its factorization.

25503787643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 25503787643 in words is "twenty-five billion, five hundred three million, seven hundred eighty-seven thousand, six hundred forty-three".