1646401256 has 16 divisors (see below), whose sum is σ = 3087710340. Its totient is φ = 823011840.

The previous prime is 1646401241. The next prime is 1646401259. The reversal of 1646401256 is 6521046461.

It can be written as a sum of positive squares in 2 ways, for example, as 1365302500 + 281098756 = 36950^2 + 16766^2 .

It is not an unprimeable number, because it can be changed into a prime (1646401259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17720 + ... + 60056.

Almost surely, 2^1646401256 is an apocalyptic number.

It is an amenable number.

1646401256 is a deficient number, since it is larger than the sum of its proper divisors (1441309084).

1646401256 is a wasteful number, since it uses less digits than its factorization.

1646401256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47204 (or 47200 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1646401256 is about 40575.8703665122. The cubic root of 1646401256 is about 1180.8060316921.

The spelling of 1646401256 in words is "one billion, six hundred forty-six million, four hundred one thousand, two hundred fifty-six".