40405179681 has 12 divisors (see below), whose sum is σ = 58364974720. Its totient is φ = 26935892280.

The previous prime is 40405179679. The next prime is 40405179691. The reversal of 40405179681 is 18697150404.

40405179681 is a `hidden beast` number, since 4 + 0 + 40 + 517 + 96 + 8 + 1 = 666.

It is not a de Polignac number, because 40405179681 - 2¹ = 40405179679 is a prime.

It is a super-2 number, since 2×40405179681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40405179611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 323640 + ... + 430758.

Almost surely, 2^40405179681 is an apocalyptic number.

It is an amenable number.

40405179681 is a deficient number, since it is larger than the sum of its proper divisors (17959795039).

40405179681 is a wasteful number, since it uses less digits than its factorization.

40405179681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149036 (or 149033 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 40405179681 in words is "forty billion, four hundred five million, one hundred seventy-nine thousand, six hundred eighty-one".