1550220555 has 64 divisors (see below), whose sum is σ = 2734018560. Its totient is φ = 745445376.

The previous prime is 1550220533. The next prime is 1550220569. The reversal of 1550220555 is 5550220551.

It is not a de Polignac number, because 1550220555 - 2⁵ = 1550220523 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 1586227 + ... + 1587203.

It is an arithmetic number, because the mean of its divisors is an integer number (42719040).

Almost surely, 2^1550220555 is an apocalyptic number.

1550220555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1550220555 is a deficient number, since it is larger than the sum of its proper divisors (1183798005).

1550220555 is a wasteful number, since it uses less digits than its factorization.

1550220555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 12500, while the sum is 30.

The square root of 1550220555 is about 39372.8403217243. The cubic root of 1550220555 is about 1157.3494165078.

The spelling of 1550220555 in words is "one billion, five hundred fifty million, two hundred twenty thousand, five hundred fifty-five".