1666851850020 has 96 divisors (see below), whose sum is σ = 5409051734016. Its totient is φ = 375628579200.

The previous prime is 1666851849977. The next prime is 1666851850021. The reversal of 1666851850020 is 200581586661.

It is not an unprimeable number, because it can be changed into a prime (1666851850021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27918736 + ... + 27978375.

It is an arithmetic number, because the mean of its divisors is an integer number (56344288896).

Almost surely, 2^{1666851850020} is an apocalyptic number.

1666851850020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666851850020 is an abundant number, since it is smaller than the sum of its proper divisors (3742199883996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666851850020 is a wasteful number, since it uses less digits than its factorization.

1666851850020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55897201 (or 55897199 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 1666851850020 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty-one million, eight hundred fifty thousand, twenty".