1255105555133 has 4 divisors (see below), whose sum is σ = 1285717885788. Its totient is φ = 1224493224480.

The previous prime is 1255105555103. The next prime is 1255105555153. The reversal of 1255105555133 is 3315555015521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 141073857604 + 1114031697529 = 375598^2 + 1055477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255105555133 - 2⁶ = 1255105555069 is a prime.

It is a super-2 number, since 2×1255105555133² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 30612330613 = 1255105555133 / (1 + 2 + 5 + 5 + 1 + 0 + 5 + 5 + 5 + 5 + 1 + 3 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255105555103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15306165266 + ... + 15306165347.

It is an arithmetic number, because the mean of its divisors is an integer number (321429471447).

Almost surely, 2^{1255105555133} is an apocalyptic number.

It is an amenable number.

1255105555133 is a deficient number, since it is larger than the sum of its proper divisors (30612330655).

1255105555133 is an equidigital number, since it uses as much as digits as its factorization.

1255105555133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30612330654.

The product of its (nonzero) digits is 281250, while the sum is 41.

The spelling of 1255105555133 in words is "one trillion, two hundred fifty-five billion, one hundred five million, five hundred fifty-five thousand, one hundred thirty-three".