2171685553809 has 8 divisors (see below), whose sum is σ = 2973839677440. Its totient is φ = 1408660899696.

The previous prime is 2171685553783. The next prime is 2171685553841. The reversal of 2171685553809 is 9083555861712.

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

It is not a de Polignac number, because 2171685553809 - 2⁵ = 2171685553777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2171685553879) 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, 9782367249 + ... + 9782367470.

It is an arithmetic number, because the mean of its divisors is an integer number (371729959680).

Almost surely, 2^{2171685553809} is an apocalyptic number.

It is an amenable number.

2171685553809 is a deficient number, since it is larger than the sum of its proper divisors (802154123631).

2171685553809 is a wasteful number, since it uses less digits than its factorization.

2171685553809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19564734759.

The product of its (nonzero) digits is 18144000, while the sum is 60.

The spelling of 2171685553809 in words is "two trillion, one hundred seventy-one billion, six hundred eighty-five million, five hundred fifty-three thousand, eight hundred nine".