408066012506665 has 4 divisors (see below), whose sum is σ = 489679215008004. Its totient is φ = 326452810005328.

The previous prime is 408066012506597. The next prime is 408066012506681. The reversal of 408066012506665 is 566605210660804.

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

It can be written as a sum of positive squares in 2 ways, for example, as 174147585857001 + 233918426649664 = 13196499^2 + 15294392^2 .

It is a cyclic number.

It is not a de Polignac number, because 408066012506665 - 2²³ = 408066004118057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40806601250662 + ... + 40806601250671.

It is an arithmetic number, because the mean of its divisors is an integer number (122419803752001).

Almost surely, 2^{408066012506665} is an apocalyptic number.

It is an amenable number.

408066012506665 is a deficient number, since it is larger than the sum of its proper divisors (81613202501339).

408066012506665 is an equidigital number, since it uses as much as digits as its factorization.

408066012506665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81613202501338.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 408066012506665 in words is "four hundred eight trillion, sixty-six billion, twelve million, five hundred six thousand, six hundred sixty-five".