64505444838 has 16 divisors (see below), whose sum is σ = 129400654656. Its totient is φ = 21436854120.

The previous prime is 64505444821. The next prime is 64505444869. The reversal of 64505444838 is 83844450546.

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, 16238056 + ... + 16242027.

It is an arithmetic number, because the mean of its divisors is an integer number (8087540916).

Almost surely, 2^64505444838 is an apocalyptic number.

64505444838 is an abundant number, since it is smaller than the sum of its proper divisors (64895209818).

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

64505444838 is a wasteful number, since it uses less digits than its factorization.

64505444838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32480419.

The product of its (nonzero) digits is 7372800, while the sum is 51.

The spelling of 64505444838 in words is "sixty-four billion, five hundred five million, four hundred forty-four thousand, eight hundred thirty-eight".