405926705781 has 6 divisors (see below), whose sum is σ = 586338575030. Its totient is φ = 270617803848.

The previous prime is 405926705773. The next prime is 405926705791. The reversal of 405926705781 is 187507629504.

405926705781 is a `hidden beast` number, since 4 + 0 + 5 + 9 + 2 + 67 + 0 + 578 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 220157085681 + 185769620100 = 469209^2 + 431010^2 .

It is not a de Polignac number, because 405926705781 - 2³ = 405926705773 is a prime.

It is a super-2 number, since 2×405926705781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405926705711) 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 5 ways as a sum of consecutive naturals, for example, 22551483646 + ... + 22551483663.

Almost surely, 2^405926705781 is an apocalyptic number.

It is an amenable number.

405926705781 is a deficient number, since it is larger than the sum of its proper divisors (180411869249).

405926705781 is a wasteful number, since it uses less digits than its factorization.

405926705781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45102967315 (or 45102967312 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 405926705781 in words is "four hundred five billion, nine hundred twenty-six million, seven hundred five thousand, seven hundred eighty-one".