408255993791 has 4 divisors (see below), whose sum is σ = 417750319272. Its totient is φ = 398761668312.

The previous prime is 408255993721. The next prime is 408255993799. The reversal of 408255993791 is 197399552804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408255993791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408255993799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4747162676 + ... + 4747162761.

It is an arithmetic number, because the mean of its divisors is an integer number (104437579818).

Almost surely, 2^408255993791 is an apocalyptic number.

408255993791 is a deficient number, since it is larger than the sum of its proper divisors (9494325481).

408255993791 is an equidigital number, since it uses as much as digits as its factorization.

408255993791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494325480.

The product of its (nonzero) digits is 24494400, while the sum is 62.

The spelling of 408255993791 in words is "four hundred eight billion, two hundred fifty-five million, nine hundred ninety-three thousand, seven hundred ninety-one".