1647255966 has 16 divisors (see below), whose sum is σ = 3331530000. Its totient is φ = 542915648.

The previous prime is 1647255949. The next prime is 1647255979. The reversal of 1647255966 is 6695527461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541841 + ... + 1542908.

It is an arithmetic number, because the mean of its divisors is an integer number (208220625).

Almost surely, 2^1647255966 is an apocalyptic number.

1647255966 is an abundant number, since it is smaller than the sum of its proper divisors (1684274034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1647255966 is a wasteful number, since it uses less digits than its factorization.

1647255966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084843.

The product of its digits is 2721600, while the sum is 51.

The square root of 1647255966 is about 40586.4012447519. The cubic root of 1647255966 is about 1181.0103302339.

The spelling of 1647255966 in words is "one billion, six hundred forty-seven million, two hundred fifty-five thousand, nine hundred sixty-six".