646510955550 has 48 divisors (see below), whose sum is σ = 1605729808560. Its totient is φ = 172146723840.

The previous prime is 646510955527. The next prime is 646510955551. The reversal of 646510955550 is 55559015646.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646510955493 and 646510955502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646510955551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3101185 + ... + 3303084.

It is an arithmetic number, because the mean of its divisors is an integer number (33452704345).

Almost surely, 2^646510955550 is an apocalyptic number.

646510955550 is an abundant number, since it is smaller than the sum of its proper divisors (959218853010).

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

646510955550 is a wasteful number, since it uses less digits than its factorization.

646510955550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6404957 (or 6404952 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 646510955550 in words is "six hundred forty-six billion, five hundred ten million, nine hundred fifty-five thousand, five hundred fifty".