408206555778 has 64 divisors (see below), whose sum is σ = 955935332352. Its totient is φ = 113769774720.

The previous prime is 408206555759. The next prime is 408206555821. The reversal of 408206555778 is 877555602804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17626875 + ... + 17650017.

It is an arithmetic number, because the mean of its divisors is an integer number (14936489568).

Almost surely, 2^408206555778 is an apocalyptic number.

408206555778 is an abundant number, since it is smaller than the sum of its proper divisors (547728776574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

408206555778 is a wasteful number, since it uses less digits than its factorization.

408206555778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33439.

The product of its (nonzero) digits is 18816000, while the sum is 57.

The spelling of 408206555778 in words is "four hundred eight billion, two hundred six million, five hundred fifty-five thousand, seven hundred seventy-eight".