1666851850019 has 8 divisors (see below), whose sum is σ = 1676431607760. Its totient is φ = 1657281816576.

The previous prime is 1666851849977. The next prime is 1666851850021. The reversal of 1666851850019 is 9100581586661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666851850019 is a prime.

It is a super-2 number, since 2×1666851850019² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666851850049) 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, 2087129 + ... + 2773050.

It is an arithmetic number, because the mean of its divisors is an integer number (209553950970).

Almost surely, 2^{1666851850019} is an apocalyptic number.

1666851850019 is a deficient number, since it is larger than the sum of its proper divisors (9579757741).

1666851850019 is a wasteful number, since it uses less digits than its factorization.

1666851850019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862149.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 1666851850019 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty-one million, eight hundred fifty thousand, nineteen".