1868394399481 has 4 divisors (see below), whose sum is σ = 1878832357200. Its totient is φ = 1857956441764.

The previous prime is 1868394399439. The next prime is 1868394399491. The reversal of 1868394399481 is 1849934938681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1868394399481 - 2¹¹ = 1868394397433 is a prime.

It is a super-2 number, since 2×1868394399481² (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 (1868394399491) 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, 5218978591 + ... + 5218978948.

It is an arithmetic number, because the mean of its divisors is an integer number (469708089300).

Almost surely, 2^{1868394399481} is an apocalyptic number.

It is an amenable number.

1868394399481 is a deficient number, since it is larger than the sum of its proper divisors (10437957719).

1868394399481 is a wasteful number, since it uses less digits than its factorization.

1868394399481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437957718.

The product of its digits is 322486272, while the sum is 73.

The spelling of 1868394399481 in words is "one trillion, eight hundred sixty-eight billion, three hundred ninety-four million, three hundred ninety-nine thousand, four hundred eighty-one".