1205255555 has 16 divisors (see below), whose sum is σ = 1669967040. Its totient is φ = 817938432.

The previous prime is 1205255551. The next prime is 1205255567. The reversal of 1205255555 is 5555525021.

It is a cyclic number.

It is not a de Polignac number, because 1205255555 - 2² = 1205255551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1205255551) 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, 174110 + ... + 180899.

It is an arithmetic number, because the mean of its divisors is an integer number (104372940).

Almost surely, 2^1205255555 is an apocalyptic number.

1205255555 is a deficient number, since it is larger than the sum of its proper divisors (464711485).

1205255555 is an equidigital number, since it uses as much as digits as its factorization.

1205255555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355118.

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

The square root of 1205255555 is about 34716.7906782871. The cubic root of 1205255555 is about 1064.2076600522.

The spelling of 1205255555 in words is "one billion, two hundred five million, two hundred fifty-five thousand, five hundred fifty-five".