405966193645 has 4 divisors (see below), whose sum is σ = 487159432380. Its totient is φ = 324772954912.

The previous prime is 405966193631. The next prime is 405966193651. The reversal of 405966193645 is 546391669504.

It is a happy number.

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 148894885161 + 257071308484 = 385869^2 + 507022^2 .

It is a cyclic number.

It is not a de Polignac number, because 405966193645 - 2⁵ = 405966193613 is a prime.

It is a super-3 number, since 3×405966193645³ (a number of 36 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 405966193645.

It is a congruent 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, 40596619360 + ... + 40596619369.

It is an arithmetic number, because the mean of its divisors is an integer number (121789858095).

Almost surely, 2^405966193645 is an apocalyptic number.

It is an amenable number.

405966193645 is a deficient number, since it is larger than the sum of its proper divisors (81193238735).

405966193645 is an equidigital number, since it uses as much as digits as its factorization.

405966193645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81193238734.

The product of its (nonzero) digits is 20995200, while the sum is 58.

The spelling of 405966193645 in words is "four hundred five billion, nine hundred sixty-six million, one hundred ninety-three thousand, six hundred forty-five".