7973771820405 has 16 divisors (see below), whose sum is σ = 12849819339840. Its totient is φ = 4222083495168.

The previous prime is 7973771820403. The next prime is 7973771820419. The reversal of 7973771820405 is 5040281773797.

It is not a de Polignac number, because 7973771820405 - 2¹ = 7973771820403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7973771820403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1912173412 + ... + 1912177581.

It is an arithmetic number, because the mean of its divisors is an integer number (803113708740).

Almost surely, 2^{7973771820405} is an apocalyptic number.

It is an amenable number.

7973771820405 is a deficient number, since it is larger than the sum of its proper divisors (4876047519435).

7973771820405 is a wasteful number, since it uses less digits than its factorization.

7973771820405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3824351140.

The product of its (nonzero) digits is 20744640, while the sum is 60.

The spelling of 7973771820405 in words is "seven trillion, nine hundred seventy-three billion, seven hundred seventy-one million, eight hundred twenty thousand, four hundred five".