384638520661 has 8 divisors (see below), whose sum is σ = 407583261720. Its totient is φ = 361729218048.

The previous prime is 384638520649. The next prime is 384638520683. The reversal of 384638520661 is 166025836483.

It can be written as a sum of positive squares in 4 ways, for example, as 147221085636 + 237417435025 = 383694^2 + 487255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 384638520661 - 2¹³ = 384638512469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 384638520599 and 384638520608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384638520061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8837256 + ... + 8880673.

It is an arithmetic number, because the mean of its divisors is an integer number (50947907715).

Almost surely, 2^384638520661 is an apocalyptic number.

It is an amenable number.

384638520661 is a deficient number, since it is larger than the sum of its proper divisors (22944741059).

384638520661 is a wasteful number, since it uses less digits than its factorization.

384638520661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17719223.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 384638520661 in words is "three hundred eighty-four billion, six hundred thirty-eight million, five hundred twenty thousand, six hundred sixty-one".