646259498056 has 8 divisors (see below), whose sum is σ = 1211736558870. Its totient is φ = 323129749024.

The previous prime is 646259498023. The next prime is 646259498057. The reversal of 646259498056 is 650894952646.

It can be written as a sum of positive squares in only one way, i.e., 399001935556 + 247257562500 = 631666^2 + 497250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (646259498057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40391218621 + ... + 40391218636.

Almost surely, 2^646259498056 is an apocalyptic number.

It is an amenable number.

646259498056 is a deficient number, since it is larger than the sum of its proper divisors (565477060814).

646259498056 is a wasteful number, since it uses less digits than its factorization.

646259498056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80782437263 (or 80782437259 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 64.

The spelling of 646259498056 in words is "six hundred forty-six billion, two hundred fifty-nine million, four hundred ninety-eight thousand, fifty-six".