1854387323881 has 4 divisors (see below), whose sum is σ = 1854397541700. Its totient is φ = 1854377106064.

The previous prime is 1854387323819. The next prime is 1854387323909. The reversal of 1854387323881 is 1883237834581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1785473198656 + 68914125225 = 1336216^2 + 262515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854387323881 - 2⁷ = 1854387323753 is a prime.

It is a super-2 number, since 2×1854387323881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854387323281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4831666 + ... + 5201323.

It is an arithmetic number, because the mean of its divisors is an integer number (463599385425).

Almost surely, 2^{1854387323881} is an apocalyptic number.

It is an amenable number.

1854387323881 is a deficient number, since it is larger than the sum of its proper divisors (10217819).

1854387323881 is a wasteful number, since it uses less digits than its factorization.

1854387323881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217818.

The product of its digits is 30965760, while the sum is 61.

The spelling of 1854387323881 in words is "one trillion, eight hundred fifty-four billion, three hundred eighty-seven million, three hundred twenty-three thousand, eight hundred eighty-one".