1222120451665 has 16 divisors (see below), whose sum is σ = 1563272006400. Its totient is φ = 914514112512.

The previous prime is 1222120451663. The next prime is 1222120451681. The reversal of 1222120451665 is 5661540212221.

It is a cyclic number.

It is not a de Polignac number, because 1222120451665 - 2¹ = 1222120451663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222120451663) 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 15 ways as a sum of consecutive naturals, for example, 81412912 + ... + 81427921.

It is an arithmetic number, because the mean of its divisors is an integer number (97704500400).

Almost surely, 2^{1222120451665} is an apocalyptic number.

It is an amenable number.

1222120451665 is a deficient number, since it is larger than the sum of its proper divisors (341151554735).

1222120451665 is a wasteful number, since it uses less digits than its factorization.

1222120451665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162840936.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 1222120451665 its reverse (5661540212221), we get a palindrome (6883660663886).

The spelling of 1222120451665 in words is "one trillion, two hundred twenty-two billion, one hundred twenty million, four hundred fifty-one thousand, six hundred sixty-five".