12555555 has 16 divisors (see below), whose sum is σ = 20189184. Its totient is φ = 6662880.

The previous prime is 12555551. The next prime is 12555577. The reversal of 12555555 is 55555521.

It is not a de Polignac number, because 12555555 - 2² = 12555551 is a prime.

It is a super-2 number, since 2×12555555² = 315283922716050, which contains 22 as substring.

12555555 is a modest number, since divided by 5555 gives 1255 as remainder.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12555551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (1261824).

Almost surely, 2^12555555 is an apocalyptic number.

12555555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12555555 is a deficient number, since it is larger than the sum of its proper divisors (7633629).

12555555 is a wasteful number, since it uses less digits than its factorization.

12555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186.

The product of its digits is 31250, while the sum is 33.

The square root of 12555555 is about 3543.3818591848. The cubic root of 12555555 is about 232.4227515366.

The spelling of 12555555 in words is "twelve million, five hundred fifty-five thousand, five hundred fifty-five".