20136335512525 has 6 divisors (see below), whose sum is σ = 24969056035562. Its totient is φ = 16109068410000.

The previous prime is 20136335512493. The next prime is 20136335512529. The reversal of 20136335512525 is 52521553363102.

It can be written as a sum of positive squares in 3 ways, for example, as 4790398935204 + 15345936577321 = 2188698^2 + 3917389^2 .

It is not a de Polignac number, because 20136335512525 - 2⁵ = 20136335512493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20136335512529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402726710226 + ... + 402726710275.

Almost surely, 2^{20136335512525} is an apocalyptic number.

20136335512525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20136335512525 is a deficient number, since it is larger than the sum of its proper divisors (4832720523037).

20136335512525 is an equidigital number, since it uses as much as digits as its factorization.

20136335512525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805453420511 (or 805453420506 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 43.

Adding to 20136335512525 its reverse (52521553363102), we get a palindrome (72657888875627).

The spelling of 20136335512525 in words is "twenty trillion, one hundred thirty-six billion, three hundred thirty-five million, five hundred twelve thousand, five hundred twenty-five".