405720217753 has 4 divisors (see below), whose sum is σ = 405916314660. Its totient is φ = 405524120848.

The previous prime is 405720217633. The next prime is 405720217781. The reversal of 405720217753 is 357712027504.

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 179565757504 + 226154460249 = 423752^2 + 475557^2 .

It is a cyclic number.

It is not a de Polignac number, because 405720217753 - 2⁹ = 405720217241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405720215753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98045350 + ... + 98049487.

It is an arithmetic number, because the mean of its divisors is an integer number (101479078665).

Almost surely, 2^405720217753 is an apocalyptic number.

It is an amenable number.

405720217753 is a deficient number, since it is larger than the sum of its proper divisors (196096907).

405720217753 is a wasteful number, since it uses less digits than its factorization.

405720217753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196096906.

The product of its (nonzero) digits is 411600, while the sum is 43.

The spelling of 405720217753 in words is "four hundred five billion, seven hundred twenty million, two hundred seventeen thousand, seven hundred fifty-three".