1011220665656 has 16 divisors (see below), whose sum is σ = 2007570439440. Its totient is φ = 475868548480.

The previous prime is 1011220665649. The next prime is 1011220665701. The reversal of 1011220665656 is 6565660221101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3717722900 + ... + 3717723171.

It is an arithmetic number, because the mean of its divisors is an integer number (125473152465).

Almost surely, 2^{1011220665656} is an apocalyptic number.

It is an amenable number.

1011220665656 is a deficient number, since it is larger than the sum of its proper divisors (996349773784).

1011220665656 is a wasteful number, since it uses less digits than its factorization.

1011220665656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7435446094 (or 7435446090 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

Adding to 1011220665656 its reverse (6565660221101), we get a palindrome (7576880886757).

The spelling of 1011220665656 in words is "one trillion, eleven billion, two hundred twenty million, six hundred sixty-five thousand, six hundred fifty-six".