1255426605 has 12 divisors (see below), whose sum is σ = 2176072860. Its totient is φ = 669560832.

The previous prime is 1255426597. The next prime is 1255426619. The reversal of 1255426605 is 5066245521.

1255426605 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 42 + 6 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 344956329 + 910470276 = 18573^2 + 30174^2 .

It is not a de Polignac number, because 1255426605 - 2³ = 1255426597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255426605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13949140 + ... + 13949229.

It is an arithmetic number, because the mean of its divisors is an integer number (181339405).

Almost surely, 2^1255426605 is an apocalyptic number.

1255426605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255426605 is a deficient number, since it is larger than the sum of its proper divisors (920646255).

1255426605 is a wasteful number, since it uses less digits than its factorization.

1255426605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27898380 (or 27898377 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1255426605 is about 35431.9997318808. Note that the first 3 decimals coincide. The cubic root of 1255426605 is about 1078.7739301331.

The spelling of 1255426605 in words is "one billion, two hundred fifty-five million, four hundred twenty-six thousand, six hundred five".