1684138865541 has 24 divisors (see below), whose sum is σ = 2468668591872. Its totient is φ = 1020502454400.

The previous prime is 1684138865527. The next prime is 1684138865561. The reversal of 1684138865541 is 1455688314861.

It is not a de Polignac number, because 1684138865541 - 2⁵ = 1684138865509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684138865561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1561965 + ... + 2409981.

It is an arithmetic number, because the mean of its divisors is an integer number (102861191328).

Almost surely, 2^{1684138865541} is an apocalyptic number.

1684138865541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1684138865541 is a deficient number, since it is larger than the sum of its proper divisors (784529726331).

1684138865541 is a wasteful number, since it uses less digits than its factorization.

1684138865541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853513 (or 853502 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 60.

The spelling of 1684138865541 in words is "one trillion, six hundred eighty-four billion, one hundred thirty-eight million, eight hundred sixty-five thousand, five hundred forty-one".