25555613606503 has 2 divisors, whose sum is σ = 25555613606504. Its totient is φ = 25555613606502.

The previous prime is 25555613606461. The next prime is 25555613606597. The reversal of 25555613606503 is 30560631655552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25555613606503 is a prime.

It is a super-3 number, since 3×25555613606503³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25555613636503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777806803251 + 12777806803252.

It is an arithmetic number, because the mean of its divisors is an integer number (12777806803252).

Almost surely, 2^{25555613606503} is an apocalyptic number.

25555613606503 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555613606503 is an equidigital number, since it uses as much as digits as its factorization.

25555613606503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150000, while the sum is 52.

The spelling of 25555613606503 in words is "twenty-five trillion, five hundred fifty-five billion, six hundred thirteen million, six hundred six thousand, five hundred three".