40021040693 has 2 divisors, whose sum is σ = 40021040694. Its totient is φ = 40021040692.

The previous prime is 40021040687. The next prime is 40021040701. The reversal of 40021040693 is 39604012004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35812534564 + 4208506129 = 189242^2 + 64873^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021040693 - 2⁴ = 40021040677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40021040623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010520346 + 20010520347.

It is an arithmetic number, because the mean of its divisors is an integer number (20010520347).

Almost surely, 2^40021040693 is an apocalyptic number.

It is an amenable number.

40021040693 is a deficient number, since it is larger than the sum of its proper divisors (1).

40021040693 is an equidigital number, since it uses as much as digits as its factorization.

40021040693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 40021040693 its reverse (39604012004), we get a palindrome (79625052697).

The spelling of 40021040693 in words is "forty billion, twenty-one million, forty thousand, six hundred ninety-three".