1687866880021 has 8 divisors (see below), whose sum is σ = 1930717667840. Its totient is φ = 1445447829168.

The previous prime is 1687866880013. The next prime is 1687866880043. The reversal of 1687866880021 is 1200886687861.

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

It is not a de Polignac number, because 1687866880021 - 2³ = 1687866880013 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 (1687866880081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107925861 + ... + 107941498.

It is an arithmetic number, because the mean of its divisors is an integer number (241339708480).

Almost surely, 2^{1687866880021} is an apocalyptic number.

It is an amenable number.

1687866880021 is a deficient number, since it is larger than the sum of its proper divisors (242850787819).

1687866880021 is a wasteful number, since it uses less digits than its factorization.

1687866880021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215868483.

The product of its (nonzero) digits is 12386304, while the sum is 61.

The spelling of 1687866880021 in words is "one trillion, six hundred eighty-seven billion, eight hundred sixty-six million, eight hundred eighty thousand, twenty-one".