1256662849 has 8 divisors (see below), whose sum is σ = 1355170880. Its totient is φ = 1158417936.

The previous prime is 1256662843. The next prime is 1256662859. The reversal of 1256662849 is 9482666521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256662849 - 2⁵ = 1256662817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256662843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55797 + ... + 75010.

It is an arithmetic number, because the mean of its divisors is an integer number (169396360).

Almost surely, 2^1256662849 is an apocalyptic number.

It is an amenable number.

1256662849 is a deficient number, since it is larger than the sum of its proper divisors (98508031).

1256662849 is a wasteful number, since it uses less digits than its factorization.

1256662849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131559.

The product of its digits is 1244160, while the sum is 49.

The square root of 1256662849 is about 35449.4407431203. The cubic root of 1256662849 is about 1079.1279108125.

The spelling of 1256662849 in words is "one billion, two hundred fifty-six million, six hundred sixty-two thousand, eight hundred forty-nine".