2015555555 has 16 divisors (see below), whose sum is σ = 2665296480. Its totient is φ = 1453794048.

The previous prime is 2015555537. The next prime is 2015555561. The reversal of 2015555555 is 5555555102.

It is a cyclic number.

It is not a de Polignac number, because 2015555555 - 2⁸ = 2015555299 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2015555555 is a modest number, since divided by 55555 gives 20155 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357770 + ... + 363359.

It is an arithmetic number, because the mean of its divisors is an integer number (166581030).

Almost surely, 2^2015555555 is an apocalyptic number.

2015555555 is a deficient number, since it is larger than the sum of its proper divisors (649740925).

2015555555 is a wasteful number, since it uses less digits than its factorization.

2015555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721190.

The product of its (nonzero) digits is 156250, while the sum is 38.

The square root of 2015555555 is about 44894.9390800344. The cubic root of 2015555555 is about 1263.1790795590.

The spelling of 2015555555 in words is "two billion, fifteen million, five hundred fifty-five thousand, five hundred fifty-five".