65556220505 has 32 divisors (see below), whose sum is σ = 87706800000. Its totient is φ = 46747210752.

The previous prime is 65556220501. The next prime is 65556220519. The reversal of 65556220505 is 50502265556.

65556220505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 65556220505 - 2² = 65556220501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65556220501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8738246 + ... + 8745744.

It is an arithmetic number, because the mean of its divisors is an integer number (2740837500).

Almost surely, 2^65556220505 is an apocalyptic number.

It is an amenable number.

65556220505 is a deficient number, since it is larger than the sum of its proper divisors (22150579495).

65556220505 is a wasteful number, since it uses less digits than its factorization.

65556220505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12953.

The product of its (nonzero) digits is 450000, while the sum is 41.

The spelling of 65556220505 in words is "sixty-five billion, five hundred fifty-six million, two hundred twenty thousand, five hundred five".