1851668668687 has 8 divisors (see below), whose sum is σ = 1913640740480. Its totient is φ = 1789836648480.

The previous prime is 1851668668679. The next prime is 1851668668693. The reversal of 1851668668687 is 7868668661581.

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

It is not a de Polignac number, because 1851668668687 - 2³ = 1851668668679 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 (1851668668627) 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, 34986012 + ... + 35038897.

It is an arithmetic number, because the mean of its divisors is an integer number (239205092560).

Almost surely, 2^{1851668668687} is an apocalyptic number.

1851668668687 is a deficient number, since it is larger than the sum of its proper divisors (61972071793).

1851668668687 is an equidigital number, since it uses as much as digits as its factorization.

1851668668687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70025793.

The product of its digits is 1114767360, while the sum is 76.

The spelling of 1851668668687 in words is "one trillion, eight hundred fifty-one billion, six hundred sixty-eight million, six hundred sixty-eight thousand, six hundred eighty-seven".