18196886887 has 8 divisors (see below), whose sum is σ = 19268474400. Its totient is φ = 17125430784.

The previous prime is 18196886843. The next prime is 18196886893. The reversal of 18196886887 is 78868869181.

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 18196886887 - 2¹⁵ = 18196854119 is a prime.

It is a super-2 number, since 2×18196886887² (a number of 21 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 (18196886837) 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, 491439 + ... + 527167.

It is an arithmetic number, because the mean of its divisors is an integer number (2408559300).

Almost surely, 2^18196886887 is an apocalyptic number.

18196886887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18196886887 is a deficient number, since it is larger than the sum of its proper divisors (1071587513).

18196886887 is a wasteful number, since it uses less digits than its factorization.

18196886887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65705.

The product of its digits is 74317824, while the sum is 70.

The spelling of 18196886887 in words is "eighteen billion, one hundred ninety-six million, eight hundred eighty-six thousand, eight hundred eighty-seven".