18945168490 has 8 divisors (see below), whose sum is σ = 34101303300. Its totient is φ = 7578067392.

The previous prime is 18945168479. The next prime is 18945168493. The reversal of 18945168490 is 9486154981.

It can be written as a sum of positive squares in 2 ways, for example, as 18912025441 + 33143049 = 137521^2 + 5757^2 .

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

It is a super-2 number, since 2×18945168490² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18945168493) 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, 947258415 + ... + 947258434.

Almost surely, 2^18945168490 is an apocalyptic number.

18945168490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18945168490 is a deficient number, since it is larger than the sum of its proper divisors (15156134810).

18945168490 is a wasteful number, since it uses less digits than its factorization.

18945168490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894516856.

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 18945168490 in words is "eighteen billion, nine hundred forty-five million, one hundred sixty-eight thousand, four hundred ninety".