65561318403 has 16 divisors (see below), whose sum is σ = 101025469440. Its totient is φ = 37042670016.

The previous prime is 65561318387. The next prime is 65561318423. The reversal of 65561318403 is 30481316556.

It is not a de Polignac number, because 65561318403 - 2⁴ = 65561318387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65561318423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17537275 + ... + 17541012.

It is an arithmetic number, because the mean of its divisors is an integer number (6314091840).

Almost surely, 2^65561318403 is an apocalyptic number.

65561318403 is a deficient number, since it is larger than the sum of its proper divisors (35464151037).

65561318403 is a wasteful number, since it uses less digits than its factorization.

65561318403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35078386.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 65561318403 in words is "sixty-five billion, five hundred sixty-one million, three hundred eighteen thousand, four hundred three".