406555221406 has 4 divisors (see below), whose sum is σ = 609832832112. Its totient is φ = 203277610702.

The previous prime is 406555221403. The next prime is 406555221433. The reversal of 406555221406 is 604122555604.

It is a happy number.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406555221403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101638805350 + ... + 101638805353.

It is an arithmetic number, because the mean of its divisors is an integer number (152458208028).

Almost surely, 2^406555221406 is an apocalyptic number.

406555221406 is a deficient number, since it is larger than the sum of its proper divisors (203277610706).

406555221406 is a wasteful number, since it uses less digits than its factorization.

406555221406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203277610705.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 406555221406 in words is "four hundred six billion, five hundred fifty-five million, two hundred twenty-one thousand, four hundred six".