1555450000 has 120 divisors (see below), whose sum is σ = 4058318376. Its totient is φ = 574080000.

The previous prime is 1555449971. The next prime is 1555450009. The reversal of 1555450000 is 545551.

It can be written as a sum of positive squares in 12 ways, for example, as 1226680576 + 328769424 = 35024^2 + 18132^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1555450009) 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 23 ways as a sum of consecutive naturals, for example, 648804 + ... + 651196.

Almost surely, 2^1555450000 is an apocalyptic number.

1555450000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555450000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2029159188).

1555450000 is an abundant number, since it is smaller than the sum of its proper divisors (2502868376).

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

1555450000 is an equidigital number, since it uses as much as digits as its factorization.

1555450000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439 (or 2413 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 1555450000 is about 39439.1937037257. The cubic root of 1555450000 is about 1158.6493395653.

Adding to 1555450000 its reverse (545551), we get a palindrome (1555995551).

The spelling of 1555450000 in words is "one billion, five hundred fifty-five million, four hundred fifty thousand".