40731639993 has 20 divisors (see below), whose sum is σ = 66377488848. Its totient is φ = 24685841880.

The previous prime is 40731639989. The next prime is 40731640003. The reversal of 40731639993 is 39993613704.

40731639993 is a `hidden beast` number, since 407 + 3 + 1 + 63 + 99 + 93 = 666.

It is not a de Polignac number, because 40731639993 - 2² = 40731639989 is a prime.

It is a super-3 number, since 3×40731639993³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40731639943) 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 19 ways as a sum of consecutive naturals, for example, 22856371 + ... + 22858152.

Almost surely, 2^40731639993 is an apocalyptic number.

It is an amenable number.

40731639993 is a deficient number, since it is larger than the sum of its proper divisors (25645848855).

40731639993 is a wasteful number, since it uses less digits than its factorization.

40731639993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45714546 (or 45714537 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 54.

The spelling of 40731639993 in words is "forty billion, seven hundred thirty-one million, six hundred thirty-nine thousand, nine hundred ninety-three".