40033336691 has 2 divisors, whose sum is σ = 40033336692. Its totient is φ = 40033336690.

The previous prime is 40033336657. The next prime is 40033336709. The reversal of 40033336691 is 19663333004.

40033336691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40033336691 - 2¹⁸ = 40033074547 is a prime.

It is a super-2 number, since 2×40033336691² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40033336391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20016668345 + 20016668346.

It is an arithmetic number, because the mean of its divisors is an integer number (20016668346).

Almost surely, 2^40033336691 is an apocalyptic number.

40033336691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40033336691 is an equidigital number, since it uses as much as digits as its factorization.

40033336691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 38.

Adding to 40033336691 its reverse (19663333004), we get a palindrome (59696669695).

The spelling of 40033336691 in words is "forty billion, thirty-three million, three hundred thirty-six thousand, six hundred ninety-one".