1866249517249 has 8 divisors (see below), whose sum is σ = 2009846706560. Its totient is φ = 1722657975696.

The previous prime is 1866249517243. The next prime is 1866249517289. The reversal of 1866249517249 is 9427159426681.

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 1866249517249 - 2¹³ = 1866249509057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866249517243) 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, 712809 + ... + 2059270.

It is an arithmetic number, because the mean of its divisors is an integer number (251230838320).

Almost surely, 2^{1866249517249} is an apocalyptic number.

It is an amenable number.

1866249517249 is a deficient number, since it is larger than the sum of its proper divisors (143597189311).

1866249517249 is a wasteful number, since it uses less digits than its factorization.

1866249517249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823879.

The product of its digits is 52254720, while the sum is 64.

The spelling of 1866249517249 in words is "one trillion, eight hundred sixty-six billion, two hundred forty-nine million, five hundred seventeen thousand, two hundred forty-nine".