408366087756221 has 4 divisors (see below), whose sum is σ = 466704100292832. Its totient is φ = 350028075219612.

The previous prime is 408366087756139. The next prime is 408366087756293. The reversal of 408366087756221 is 122657780663804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408366087756221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408366087756821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29169006268295 + ... + 29169006268308.

It is an arithmetic number, because the mean of its divisors is an integer number (116676025073208).

Almost surely, 2^{408366087756221} is an apocalyptic number.

It is an amenable number.

408366087756221 is a deficient number, since it is larger than the sum of its proper divisors (58338012536611).

408366087756221 is an equidigital number, since it uses as much as digits as its factorization.

408366087756221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58338012536610.

The product of its (nonzero) digits is 162570240, while the sum is 65.

The spelling of 408366087756221 in words is "four hundred eight trillion, three hundred sixty-six billion, eighty-seven million, seven hundred fifty-six thousand, two hundred twenty-one".