384637309866 has 12 divisors (see below), whose sum is σ = 833380838082. Its totient is φ = 128212436616.

The previous prime is 384637309817. The next prime is 384637309871. The reversal of 384637309866 is 668903736483.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 383063204241 + 1574105625 = 618921^2 + 39675^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10684369701 + ... + 10684369736.

Almost surely, 2^384637309866 is an apocalyptic number.

384637309866 is an abundant number, since it is smaller than the sum of its proper divisors (448743528216).

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

384637309866 is a wasteful number, since it uses less digits than its factorization.

384637309866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21368739445 (or 21368739442 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 63.

The spelling of 384637309866 in words is "three hundred eighty-four billion, six hundred thirty-seven million, three hundred nine thousand, eight hundred sixty-six".