1555055540 has 24 divisors (see below), whose sum is σ = 3266619720. Its totient is φ = 621831168.

The previous prime is 1555055533. The next prime is 1555055549. The reversal of 1555055540 is 455505551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 337603876 + 1217451664 = 18374^2 + 34892^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1555055540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555055549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67784 + ... + 87776.

It is an arithmetic number, because the mean of its divisors is an integer number (136109155).

Almost surely, 2^1555055540 is an apocalyptic number.

1555055540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555055540 is an abundant number, since it is smaller than the sum of its proper divisors (1711564180).

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

1555055540 is a wasteful number, since it uses less digits than its factorization.

1555055540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23891 (or 23889 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 35.

The square root of 1555055540 is about 39434.1925237477. The cubic root of 1555055540 is about 1158.5513873202.

The spelling of 1555055540 in words is "one billion, five hundred fifty-five million, fifty-five thousand, five hundred forty".