201639818450 has 48 divisors (see below), whose sum is σ = 430660215744. Its totient is φ = 68805979200.

The previous prime is 201639818411. The next prime is 201639818461. The reversal of 201639818450 is 54818936102.

It is a happy number.

201639818450 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 201639818395 and 201639818404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1291349 + ... + 1439048.

It is an arithmetic number, because the mean of its divisors is an integer number (8972087828).

Almost surely, 2^201639818450 is an apocalyptic number.

201639818450 is an abundant number, since it is smaller than the sum of its proper divisors (229020397294).

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

201639818450 is a wasteful number, since it uses less digits than its factorization.

201639818450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730627 (or 2730622 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 201639818450 in words is "two hundred one billion, six hundred thirty-nine million, eight hundred eighteen thousand, four hundred fifty".