1800168965921 has 8 divisors (see below), whose sum is σ = 1906074473184. Its totient is φ = 1694264927040.

The previous prime is 1800168965899. The next prime is 1800168965957. The reversal of 1800168965921 is 1295698610081.

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

It is a cyclic number.

It is not a de Polignac number, because 1800168965921 - 2⁶ = 1800168965857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1800168965981) 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, 3083966 + ... + 3620936.

It is an arithmetic number, because the mean of its divisors is an integer number (238259309148).

Almost surely, 2^{1800168965921} is an apocalyptic number.

It is an amenable number.

1800168965921 is a deficient number, since it is larger than the sum of its proper divisors (105905507263).

1800168965921 is a wasteful number, since it uses less digits than its factorization.

1800168965921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734191.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 1800168965921 in words is "one trillion, eight hundred billion, one hundred sixty-eight million, nine hundred sixty-five thousand, nine hundred twenty-one".