1220661552 has 60 divisors (see below), whose sum is σ = 3466123640. Its totient is φ = 369895680.

The previous prime is 1220661509. The next prime is 1220661569. The reversal of 1220661552 is 2551660221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99277 + ... + 110892.

Almost surely, 2^1220661552 is an apocalyptic number.

1220661552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220661552 is an abundant number, since it is smaller than the sum of its proper divisors (2245462088).

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

1220661552 is a wasteful number, since it uses less digits than its factorization.

1220661552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210202 (or 210185 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1220661552 is about 34937.9671990229. The cubic root of 1220661552 is about 1068.7228340415.

The spelling of 1220661552 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, five hundred fifty-two".