18919865245 has 8 divisors (see below), whose sum is σ = 22705535160. Its totient is φ = 15134760960.

The previous prime is 18919865243. The next prime is 18919865249. The reversal of 18919865245 is 54256891981.

It can be written as a sum of positive squares in 4 ways, for example, as 304537401 + 18615327844 = 17451^2 + 136438^2 .

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

It is not a de Polignac number, because 18919865245 - 2¹ = 18919865243 is a prime.

It is a super-2 number, since 2×18919865245² (a number of 21 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 18919865245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919865243) 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, 63960 + ... + 204769.

It is an arithmetic number, because the mean of its divisors is an integer number (2838191895).

Almost surely, 2^18919865245 is an apocalyptic number.

It is an amenable number.

18919865245 is a deficient number, since it is larger than the sum of its proper divisors (3785669915).

18919865245 is a wasteful number, since it uses less digits than its factorization.

18919865245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282815.

The product of its digits is 6220800, while the sum is 58.

The spelling of 18919865245 in words is "eighteen billion, nine hundred nineteen million, eight hundred sixty-five thousand, two hundred forty-five".