406665054026121 has 16 divisors (see below), whose sum is σ = 591524725970880. Its totient is φ = 246458702392320.

The previous prime is 406665054026081. The next prime is 406665054026183. The reversal of 406665054026121 is 121620450566604.

It is a happy number.

It is not a de Polignac number, because 406665054026121 - 2²⁹ = 406664517155209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (406665054026191) 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, 122505156 + ... + 125780933.

It is an arithmetic number, because the mean of its divisors is an integer number (36970295373180).

Almost surely, 2^{406665054026121} is an apocalyptic number.

It is an amenable number.

406665054026121 is a deficient number, since it is larger than the sum of its proper divisors (184859671944759).

406665054026121 is a wasteful number, since it uses less digits than its factorization.

406665054026121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248335736.

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 406665054026121 in words is "four hundred six trillion, six hundred sixty-five billion, fifty-four million, twenty-six thousand, one hundred twenty-one".