1551440000 has 320 divisors, whose sum is σ = 4416461280. Its totient is φ = 537600000.

The previous prime is 1551439979. The next prime is 1551440017. The reversal of 1551440000 is 441551.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36079979 + ... + 36080021.

Almost surely, 2^1551440000 is an apocalyptic number.

1551440000 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 1551440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2208230640).

1551440000 is an abundant number, since it is smaller than the sum of its proper divisors (2865021280).

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

1551440000 is an equidigital number, since it uses as much as digits as its factorization.

1551440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1551440000 is about 39388.3231427793. The cubic root of 1551440000 is about 1157.6528043182.

Adding to 1551440000 its reverse (441551), we get a palindrome (1551881551).

The spelling of 1551440000 in words is "one billion, five hundred fifty-one million, four hundred forty thousand".