555555161555555 has 32 divisors (see below), whose sum is σ = 765257187609600. Its totient is φ = 379275740260992.

The previous prime is 555555161555531. The next prime is 555555161555633.

It is a happy number.

555555161555555 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 555555161555555 - 2¹⁴ = 555555161539171 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238964564 + ... + 241278206.

It is an arithmetic number, because the mean of its divisors is an integer number (23914287112800).

Almost surely, 2^{555555161555555} is an apocalyptic number.

555555161555555 is a deficient number, since it is larger than the sum of its proper divisors (209702026054045).

555555161555555 is a wasteful number, since it uses less digits than its factorization.

555555161555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343843.

The product of its digits is 1464843750, while the sum is 68.

The spelling of 555555161555555 in words is "five hundred fifty-five trillion, five hundred fifty-five billion, one hundred sixty-one million, five hundred fifty-five thousand, five hundred fifty-five".