12177808420805 has 16 divisors (see below), whose sum is σ = 14624529024000. Its totient is φ = 9734808147840.

The previous prime is 12177808420777. The next prime is 12177808420829. The reversal of 12177808420805 is 50802480877121.

It is not a de Polignac number, because 12177808420805 - 2¹⁸ = 12177808158661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241938881 + ... + 241989209.

It is an arithmetic number, because the mean of its divisors is an integer number (914033064000).

Almost surely, 2^{12177808420805} is an apocalyptic number.

It is an amenable number.

12177808420805 is a deficient number, since it is larger than the sum of its proper divisors (2446720603195).

12177808420805 is a wasteful number, since it uses less digits than its factorization.

12177808420805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86324.

The product of its (nonzero) digits is 2007040, while the sum is 53.

The spelling of 12177808420805 in words is "twelve trillion, one hundred seventy-seven billion, eight hundred eight million, four hundred twenty thousand, eight hundred five".