1555540000 has 240 divisors, whose sum is σ = 4496760576. Its totient is φ = 518400000.

The previous prime is 1555539989. The next prime is 1555540003. The reversal of 1555540000 is 455551.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555540003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5739865 + ... + 5740135.

Almost surely, 2^1555540000 is an apocalyptic number.

1555540000 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 1555540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2248380288).

1555540000 is an abundant number, since it is smaller than the sum of its proper divisors (2941220576).

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

1555540000 is an equidigital number, since it uses as much as digits as its factorization.

1555540000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 326 counting only the distinct ones).

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

The square root of 1555540000 is about 39440.3346841783. The cubic root of 1555540000 is about 1158.6716860308.

Adding to 1555540000 its reverse (455551), we get a palindrome (1555995551).

It can be divided in two parts, 15555 and 40000, that added together give a palindrome (55555).

The spelling of 1555540000 in words is "one billion, five hundred fifty-five million, five hundred forty thousand".