1618861888999 has 8 divisors (see below), whose sum is σ = 1669750608240. Its totient is φ = 1568348732736.

The previous prime is 1618861888981. The next prime is 1618861889017. The reversal of 1618861888999 is 9998881688161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1618861888981) and next prime (1618861889017).

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 1618861888999 - 2¹³ = 1618861880807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618861885999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93881989 + ... + 93899230.

It is an arithmetic number, because the mean of its divisors is an integer number (208718826030).

Almost surely, 2^{1618861888999} is an apocalyptic number.

1618861888999 is a deficient number, since it is larger than the sum of its proper divisors (50888719241).

1618861888999 is a wasteful number, since it uses less digits than its factorization.

1618861888999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187781489.

The product of its digits is 859963392, while the sum is 82.

The spelling of 1618861888999 in words is "one trillion, six hundred eighteen billion, eight hundred sixty-one million, eight hundred eighty-eight thousand, nine hundred ninety-nine".