406555705843840 has 64 divisors (see below), whose sum is σ = 1110768267764160. Its totient is φ = 139390527716352.

The previous prime is 406555705843787. The next prime is 406555705843967. The reversal of 406555705843840 is 48348507555604.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45374516262 + ... + 45374525221.

It is an arithmetic number, because the mean of its divisors is an integer number (17355754183815).

Almost surely, 2^{406555705843840} is an apocalyptic number.

406555705843840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406555705843840 is an abundant number, since it is smaller than the sum of its proper divisors (704212561920320).

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

406555705843840 is an equidigital number, since it uses as much as digits as its factorization.

406555705843840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90749041509 (or 90749041497 counting only the distinct ones).

The product of its (nonzero) digits is 322560000, while the sum is 64.

The spelling of 406555705843840 in words is "four hundred six trillion, five hundred fifty-five billion, seven hundred five million, eight hundred forty-three thousand, eight hundred forty".