18487487491919 has 8 divisors (see below), whose sum is σ = 18495233331168. Its totient is φ = 18479742524640.

The previous prime is 18487487491909. The next prime is 18487487491973. The reversal of 18487487491919 is 91919478478481.

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 18487487491919 - 2¹² = 18487487487823 is a prime.

It is a super-2 number, since 2×18487487491919² (a number of 27 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 (18487487491909) 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, 44068289 + ... + 44485829.

It is an arithmetic number, because the mean of its divisors is an integer number (2311904166396).

Almost surely, 2^{18487487491919} is an apocalyptic number.

18487487491919 is a deficient number, since it is larger than the sum of its proper divisors (7745839249).

18487487491919 is a wasteful number, since it uses less digits than its factorization.

18487487491919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435985.

The product of its digits is 1170505728, while the sum is 80.

The spelling of 18487487491919 in words is "eighteen trillion, four hundred eighty-seven billion, four hundred eighty-seven million, four hundred ninety-one thousand, nine hundred nineteen".