113256205561 has 4 divisors (see below), whose sum is σ = 113951029072. Its totient is φ = 112561382052.

The previous prime is 113256205523. The next prime is 113256205603. The reversal of 113256205561 is 165502652311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 113256205561 - 2¹⁵ = 113256172793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 113256205561.

It is not an unprimeable number, because it can be changed into a prime (113256205261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347411511 + ... + 347411836.

It is an arithmetic number, because the mean of its divisors is an integer number (28487757268).

Almost surely, 2^113256205561 is an apocalyptic number.

It is an amenable number.

113256205561 is a deficient number, since it is larger than the sum of its proper divisors (694823511).

113256205561 is an equidigital number, since it uses as much as digits as its factorization.

113256205561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694823510.

The product of its (nonzero) digits is 54000, while the sum is 37.

Adding to 113256205561 its reverse (165502652311), we get a palindrome (278758857872).

The spelling of 113256205561 in words is "one hundred thirteen billion, two hundred fifty-six million, two hundred five thousand, five hundred sixty-one".