405427727661 has 128 divisors (see below), whose sum is σ = 641374433280. Its totient is φ = 225308160000.

The previous prime is 405427727647. The next prime is 405427727681. The reversal of 405427727661 is 166727724504.

It is not a de Polignac number, because 405427727661 - 2⁷ = 405427727533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405427727641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 796517875 + ... + 796518383.

It is an arithmetic number, because the mean of its divisors is an integer number (5010737760).

Almost surely, 2^405427727661 is an apocalyptic number.

It is an amenable number.

405427727661 is a deficient number, since it is larger than the sum of its proper divisors (235946705619).

405427727661 is a wasteful number, since it uses less digits than its factorization.

405427727661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its (nonzero) digits is 3951360, while the sum is 51.

The spelling of 405427727661 in words is "four hundred five billion, four hundred twenty-seven million, seven hundred twenty-seven thousand, six hundred sixty-one".