1216611010064 has 20 divisors (see below), whose sum is σ = 2357484238956. Its totient is φ = 608227980672.

The previous prime is 1216611010063. The next prime is 1216611010103. The reversal of 1216611010064 is 4600101166121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33345681664 + 1183265328400 = 182608^2 + 1087780^2 .

It is not an unprimeable number, because it can be changed into a prime (1216611010063) 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 in 3 ways as a sum of consecutive naturals, for example, 4715699 + ... + 4966994.

Almost surely, 2^{1216611010064} is an apocalyptic number.

It is an amenable number.

1216611010064 is a deficient number, since it is larger than the sum of its proper divisors (1140873228892).

1216611010064 is an equidigital number, since it uses as much as digits as its factorization.

1216611010064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9690554 (or 9690548 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 1216611010064 its reverse (4600101166121), we get a palindrome (5816712176185).

The spelling of 1216611010064 in words is "one trillion, two hundred sixteen billion, six hundred eleven million, ten thousand, sixty-four".