64005111556 has 6 divisors (see below), whose sum is σ = 112008945230. Its totient is φ = 32002555776.

The previous prime is 64005111497. The next prime is 64005111557. The reversal of 64005111556 is 65511150046.

It can be written as a sum of positive squares in only one way, i.e., 33348603456 + 30656508100 = 182616^2 + 175090^2 .

It is a super-2 number, since 2×64005111556² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64005111557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000638941 + ... + 8000638948.

Almost surely, 2^64005111556 is an apocalyptic number.

It is an amenable number.

64005111556 is a deficient number, since it is larger than the sum of its proper divisors (48003833674).

64005111556 is a wasteful number, since it uses less digits than its factorization.

64005111556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001277893 (or 16001277891 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

It can be divided in two parts, 64005 and 111556, that added together give a square (175561 = 419²).

The spelling of 64005111556 in words is "sixty-four billion, five million, one hundred eleven thousand, five hundred fifty-six".