1220531633356 has 18 divisors (see below), whose sum is σ = 2484653682588. Its totient is φ = 523084985640.

The previous prime is 1220531633341. The next prime is 1220531633371. The reversal of 1220531633356 is 6533361350221.

It is an interprime number because it is at equal distance from previous prime (1220531633341) and next prime (1220531633371).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3113600910 + ... + 3113601301.

Almost surely, 2^{1220531633356} is an apocalyptic number.

It is an amenable number.

1220531633356 is an abundant number, since it is smaller than the sum of its proper divisors (1264122049232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220531633356 is a wasteful number, since it uses less digits than its factorization.

1220531633356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227202229 (or 6227202220 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 40.

Adding to 1220531633356 its reverse (6533361350221), we get a palindrome (7753892983577).

The spelling of 1220531633356 in words is "one trillion, two hundred twenty billion, five hundred thirty-one million, six hundred thirty-three thousand, three hundred fifty-six".