1220253656 has 16 divisors (see below), whose sum is σ = 2341185000. Its totient is φ = 595937664.

The previous prime is 1220253649. The next prime is 1220253667. The reversal of 1220253656 is 6563520221.

It is a congruent number.

It is an unprimeable number.

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, 1773281 + ... + 1773968.

Almost surely, 2^1220253656 is an apocalyptic number.

It is an amenable number.

1220253656 is a deficient number, since it is larger than the sum of its proper divisors (1120931344).

1220253656 is a wasteful number, since it uses less digits than its factorization.

1220253656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547298 (or 3547294 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 1220253656 is about 34932.1292795043. The cubic root of 1220253656 is about 1068.6037793825.

Adding to 1220253656 its reverse (6563520221), we get a palindrome (7783773877).

The spelling of 1220253656 in words is "one billion, two hundred twenty million, two hundred fifty-three thousand, six hundred fifty-six".