1641820880806 has 16 divisors (see below), whose sum is σ = 2475877321008. Its totient is φ = 816529766400.

The previous prime is 1641820880801. The next prime is 1641820880879. The reversal of 1641820880806 is 6080880281461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641820880801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2173521 + ... + 2829811.

It is an arithmetic number, because the mean of its divisors is an integer number (154742332563).

Almost surely, 2^{1641820880806} is an apocalyptic number.

1641820880806 is a deficient number, since it is larger than the sum of its proper divisors (834056440202).

1641820880806 is a wasteful number, since it uses less digits than its factorization.

1641820880806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662967.

The product of its (nonzero) digits is 1179648, while the sum is 52.

The spelling of 1641820880806 in words is "one trillion, six hundred forty-one billion, eight hundred twenty million, eight hundred eighty thousand, eight hundred six".