261656225130603 has 8 divisors (see below), whose sum is σ = 350411860968768. Its totient is φ = 173669036356424.

The previous prime is 261656225130511. The next prime is 261656225130611. The reversal of 261656225130603 is 306031522656162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261656225130603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261656225130613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192111765201 + ... + 192111766562.

It is an arithmetic number, because the mean of its divisors is an integer number (43801482621096).

Almost surely, 2^{261656225130603} is an apocalyptic number.

261656225130603 is a deficient number, since it is larger than the sum of its proper divisors (88755635838165).

261656225130603 is a wasteful number, since it uses less digits than its factorization.

261656225130603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384223531993.

The product of its (nonzero) digits is 2332800, while the sum is 48.

Adding to 261656225130603 its reverse (306031522656162), we get a palindrome (567687747786765).

The spelling of 261656225130603 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred twenty-five million, one hundred thirty thousand, six hundred three".