1555555555 has 8 divisors (see below), whose sum is σ = 1964912400. Its totient is φ = 1178947296.

The previous prime is 1555555451. The next prime is 1555555577. The reversal of 1555555555 is 5555555551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1555555555 - 2⁷ = 1555555427 is a prime.

It is a nude number because it is divisible by every one of its digits.

1555555555 is a modest number, since divided by 55555 gives 15555 as remainder.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8187040 + ... + 8187229.

It is an arithmetic number, because the mean of its divisors is an integer number (245614050).

Almost surely, 2^1555555555 is an apocalyptic number.

1555555555 is a deficient number, since it is larger than the sum of its proper divisors (409356845).

1555555555 is a wasteful number, since it uses less digits than its factorization.

1555555555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16374293.

The product of its digits is 1953125, while the sum is 46.

The square root of 1555555555 is about 39440.5318802878. The cubic root of 1555555555 is about 1158.6755481575.

The spelling of 1555555555 in words is "one billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-five".