261655433413106 has 4 divisors (see below), whose sum is σ = 392483150119662. Its totient is φ = 130827716706552.

The previous prime is 261655433413103. The next prime is 261655433413163. The reversal of 261655433413106 is 601314334556162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 236863150148881 + 24792283264225 = 15390359^2 + 4979185^2 .

It is not an unprimeable number, because it can be changed into a prime (261655433413103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65413858353275 + ... + 65413858353278.

Almost surely, 2^{261655433413106} is an apocalyptic number.

261655433413106 is a deficient number, since it is larger than the sum of its proper divisors (130827716706556).

261655433413106 is a wasteful number, since it uses less digits than its factorization.

261655433413106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130827716706555.

The product of its (nonzero) digits is 4665600, while the sum is 50.

Adding to 261655433413106 its reverse (601314334556162), we get a palindrome (862969767969268).

The spelling of 261655433413106 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred thirty-three million, four hundred thirteen thousand, one hundred six".