261053636433 has 16 divisors (see below), whose sum is σ = 348957100800. Its totient is φ = 173593211904.

The previous prime is 261053636381. The next prime is 261053636447. The reversal of 261053636433 is 334636350162.

It is a happy number.

It is not a de Polignac number, because 261053636433 - 2³² = 256758669137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261053636633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4474035 + ... + 4532007.

It is an arithmetic number, because the mean of its divisors is an integer number (21809818800).

Almost surely, 2^261053636433 is an apocalyptic number.

It is an amenable number.

261053636433 is a deficient number, since it is larger than the sum of its proper divisors (87903464367).

261053636433 is a wasteful number, since it uses less digits than its factorization.

261053636433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61768.

The product of its (nonzero) digits is 699840, while the sum is 42.

Adding to 261053636433 its reverse (334636350162), we get a palindrome (595689986595).

The spelling of 261053636433 in words is "two hundred sixty-one billion, fifty-three million, six hundred thirty-six thousand, four hundred thirty-three".