1687321800001 has 4 divisors (see below), whose sum is σ = 1690758301104. Its totient is φ = 1683885298900.

The previous prime is 1687321799957. The next prime is 1687321800037. The reversal of 1687321800001 is 1000081237861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1687321800001 - 2³⁹ = 1137565986113 is a prime.

It is a super-2 number, since 2×1687321800001² (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 (1687321800091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718249815 + ... + 1718250796.

It is an arithmetic number, because the mean of its divisors is an integer number (422689575276).

Almost surely, 2^{1687321800001} is an apocalyptic number.

It is an amenable number.

1687321800001 is a deficient number, since it is larger than the sum of its proper divisors (3436501103).

1687321800001 is an equidigital number, since it uses as much as digits as its factorization.

1687321800001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436501102.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 1687321800001 in words is "one trillion, six hundred eighty-seven billion, three hundred twenty-one million, eight hundred thousand, one".