1557221450 has 24 divisors (see below), whose sum is σ = 2989868160. Its totient is φ = 602794800.

The previous prime is 1557221447. The next prime is 1557221453. The reversal of 1557221450 is 541227551.

It is an interprime number because it is at equal distance from previous prime (1557221447) and next prime (1557221453).

It is not an unprimeable number, because it can be changed into a prime (1557221453) by changing a digit.

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, 500780 + ... + 503879.

It is an arithmetic number, because the mean of its divisors is an integer number (124577840).

Almost surely, 2^1557221450 is an apocalyptic number.

1557221450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1557221450 is a deficient number, since it is larger than the sum of its proper divisors (1432646710).

1557221450 is a wasteful number, since it uses less digits than its factorization.

1557221450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004702 (or 1004697 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 1557221450 is about 39461.6453027494. The cubic root of 1557221450 is about 1159.0890216925.

The spelling of 1557221450 in words is "one billion, five hundred fifty-seven million, two hundred twenty-one thousand, four hundred fifty".