1557221650 has 24 divisors (see below), whose sum is σ = 2906693424. Its totient is φ = 620682000.

The previous prime is 1557221609. The next prime is 1557221669. The reversal of 1557221650 is 561227551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40876 + ... + 69175.

It is an arithmetic number, because the mean of its divisors is an integer number (121112226).

Almost surely, 2^1557221650 is an apocalyptic number.

1557221650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1557221650 is a deficient number, since it is larger than the sum of its proper divisors (1349471774).

1557221650 is a wasteful number, since it uses less digits than its factorization.

1557221650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110346 (or 110341 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1557221650 is about 39461.6478368555. The cubic root of 1557221650 is about 1159.0890713146.

The spelling of 1557221650 in words is "one billion, five hundred fifty-seven million, two hundred twenty-one thousand, six hundred fifty".