65556505601 has 4 divisors (see below), whose sum is σ = 67155444804. Its totient is φ = 63957566400.

The previous prime is 65556505559. The next prime is 65556505603. The reversal of 65556505601 is 10650565556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11453280400 + 54103225201 = 107020^2 + 232601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65556505601 is a prime.

It is a super-2 number, since 2×65556505601² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65556505603) 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, 799469540 + ... + 799469621.

It is an arithmetic number, because the mean of its divisors is an integer number (16788861201).

Almost surely, 2^65556505601 is an apocalyptic number.

It is an amenable number.

65556505601 is a deficient number, since it is larger than the sum of its proper divisors (1598939203).

65556505601 is a wasteful number, since it uses less digits than its factorization.

65556505601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598939202.

The product of its (nonzero) digits is 675000, while the sum is 44.

It can be divided in two parts, 6555 and 6505601, that added together give a palindrome (6512156).

The spelling of 65556505601 in words is "sixty-five billion, five hundred fifty-six million, five hundred five thousand, six hundred one".