1255890866 has 4 divisors (see below), whose sum is σ = 1883836302. Its totient is φ = 627945432.

The previous prime is 1255890859. The next prime is 1255890869. The reversal of 1255890866 is 6680985521.

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

It can be written as a sum of positive squares in only one way, i.e., 1014741025 + 241149841 = 31855^2 + 15529^2 .

It is not an unprimeable number, because it can be changed into a prime (1255890869) by changing a digit.

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, 313972715 + ... + 313972718.

Almost surely, 2^1255890866 is an apocalyptic number.

1255890866 is a deficient number, since it is larger than the sum of its proper divisors (627945436).

1255890866 is an equidigital number, since it uses as much as digits as its factorization.

1255890866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627945435.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 1255890866 is about 35438.5505629110. The cubic root of 1255890866 is about 1078.9068918259.

The spelling of 1255890866 in words is "one billion, two hundred fifty-five million, eight hundred ninety thousand, eight hundred sixty-six".