854778103999 has 4 divisors (see below), whose sum is σ = 875626350480. Its totient is φ = 833929857520.

The previous prime is 854778103979. The next prime is 854778104069. The reversal of 854778103999 is 999301877458.

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

It is a cyclic number.

It is not a de Polignac number, because 854778103999 - 2¹¹ = 854778101951 is a prime.

It is a super-2 number, since 2×854778103999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (854778103939) 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, 10424123179 + ... + 10424123260.

It is an arithmetic number, because the mean of its divisors is an integer number (218906587620).

Almost surely, 2^854778103999 is an apocalyptic number.

854778103999 is a deficient number, since it is larger than the sum of its proper divisors (20848246481).

854778103999 is a wasteful number, since it uses less digits than its factorization.

854778103999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20848246480.

The product of its (nonzero) digits is 137168640, while the sum is 70.

The spelling of 854778103999 in words is "eight hundred fifty-four billion, seven hundred seventy-eight million, one hundred three thousand, nine hundred ninety-nine".