384733779561 has 16 divisors (see below), whose sum is σ = 583877824320. Its totient is φ = 250233351840.

The previous prime is 384733779527. The next prime is 384733779581. The reversal of 384733779561 is 165977337483.

It is a happy number.

384733779561 is a `hidden beast` number, since 3 + 8 + 473 + 3 + 77 + 95 + 6 + 1 = 666.

It is not a de Polignac number, because 384733779561 - 2⁹ = 384733779049 is a prime.

It is a super-2 number, since 2×384733779561² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (384733779581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173772055 + ... + 173774268.

It is an arithmetic number, because the mean of its divisors is an integer number (36492364020).

Almost surely, 2^384733779561 is an apocalyptic number.

It is an amenable number.

384733779561 is a deficient number, since it is larger than the sum of its proper divisors (199144044759).

384733779561 is a wasteful number, since it uses less digits than its factorization.

384733779561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347546373 (or 347546367 counting only the distinct ones).

The product of its digits is 80015040, while the sum is 63.

The spelling of 384733779561 in words is "three hundred eighty-four billion, seven hundred thirty-three million, seven hundred seventy-nine thousand, five hundred sixty-one".