1255105125566 has 4 divisors (see below), whose sum is σ = 1882657688352. Its totient is φ = 627552562782.

The previous prime is 1255105125529. The next prime is 1255105125683. The reversal of 1255105125566 is 6655215015521.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313776281390 + ... + 313776281393.

It is an arithmetic number, because the mean of its divisors is an integer number (470664422088).

Almost surely, 2^{1255105125566} is an apocalyptic number.

1255105125566 is a deficient number, since it is larger than the sum of its proper divisors (627552562786).

1255105125566 is an equidigital number, since it uses as much as digits as its factorization.

1255105125566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627552562785.

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 1255105125566 in words is "one trillion, two hundred fifty-five billion, one hundred five million, one hundred twenty-five thousand, five hundred sixty-six".