18954197789378 has 8 divisors (see below), whose sum is σ = 29124742944780. Its totient is φ = 9245950141120.

The previous prime is 18954197789281. The next prime is 18954197789381. The reversal of 18954197789378 is 87398779145981.

It can be written as a sum of positive squares in 2 ways, for example, as 18462464459209 + 491733330169 = 4296797^2 + 701237^2 .

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

It is a super-2 number, since 2×18954197789378² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18954197789378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115574376683 + ... + 115574376846.

Almost surely, 2^{18954197789378} is an apocalyptic number.

18954197789378 is a deficient number, since it is larger than the sum of its proper divisors (10170545155402).

18954197789378 is a wasteful number, since it uses less digits than its factorization.

18954197789378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231148753572.

The product of its digits is 7681443840, while the sum is 86.

The spelling of 18954197789378 in words is "eighteen trillion, nine hundred fifty-four billion, one hundred ninety-seven million, seven hundred eighty-nine thousand, three hundred seventy-eight".