25538683501 has 2 divisors, whose sum is σ = 25538683502. Its totient is φ = 25538683500.

The previous prime is 25538683477. The next prime is 25538683591. The reversal of 25538683501 is 10538683552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24023450025 + 1515233476 = 154995^2 + 38926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25538683501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25538683591) 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, 12769341750 + 12769341751.

It is an arithmetic number, because the mean of its divisors is an integer number (12769341751).

Almost surely, 2^25538683501 is an apocalyptic number.

It is an amenable number.

25538683501 is a deficient number, since it is larger than the sum of its proper divisors (1).

25538683501 is an equidigital number, since it uses as much as digits as its factorization.

25538683501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864000, while the sum is 46.

The spelling of 25538683501 in words is "twenty-five billion, five hundred thirty-eight million, six hundred eighty-three thousand, five hundred one".