1641820880807 has 64 divisors (see below), whose sum is σ = 1894674862080. Its totient is φ = 1414632038400.

The previous prime is 1641820880801. The next prime is 1641820880879. The reversal of 1641820880807 is 7080880281461.

It is a cyclic number.

It is not a de Polignac number, because 1641820880807 - 2¹⁸ = 1641820618663 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 (1641820880801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129138683 + ... + 129151395.

It is an arithmetic number, because the mean of its divisors is an integer number (29604294720).

Almost surely, 2^{1641820880807} is an apocalyptic number.

1641820880807 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1641820880807 is a deficient number, since it is larger than the sum of its proper divisors (252853981273).

1641820880807 is a wasteful number, since it uses less digits than its factorization.

1641820880807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12984.

The product of its (nonzero) digits is 1376256, while the sum is 53.

The spelling of 1641820880807 in words is "one trillion, six hundred forty-one billion, eight hundred twenty million, eight hundred eighty thousand, eight hundred seven".