18783450274381 has 8 divisors (see below), whose sum is σ = 20229419279160. Its totient is φ = 17337636728832.

The previous prime is 18783450274331. The next prime is 18783450274409. The reversal of 18783450274381 is 18347205438781.

It can be written as a sum of positive squares in 4 ways, for example, as 180144220356 + 18603306054025 = 424434^2 + 4313155^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18783450274381 - 2¹⁵ = 18783450241613 is a prime.

It is a super-2 number, since 2×18783450274381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18783450274331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38613796 + ... + 39097213.

It is an arithmetic number, because the mean of its divisors is an integer number (2528677409895).

Almost surely, 2^{18783450274381} is an apocalyptic number.

It is an amenable number.

18783450274381 is a deficient number, since it is larger than the sum of its proper divisors (1445969004779).

18783450274381 is a wasteful number, since it uses less digits than its factorization.

18783450274381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77729615.

The product of its (nonzero) digits is 36126720, while the sum is 61.

The spelling of 18783450274381 in words is "eighteen trillion, seven hundred eighty-three billion, four hundred fifty million, two hundred seventy-four thousand, three hundred eighty-one".