40490006681 has 2 divisors, whose sum is σ = 40490006682. Its totient is φ = 40490006680.

The previous prime is 40490006663. The next prime is 40490006693. The reversal of 40490006681 is 18660009404.

40490006681 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 can be written as a sum of positive squares in only one way, i.e., 27634075225 + 12855931456 = 166235^2 + 113384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40490006681 is a prime.

It is a super-2 number, since 2×40490006681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40490006651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20245003340 + 20245003341.

It is an arithmetic number, because the mean of its divisors is an integer number (20245003341).

Almost surely, 2^40490006681 is an apocalyptic number.

It is an amenable number.

40490006681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40490006681 is an equidigital number, since it uses as much as digits as its factorization.

40490006681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 40490006681 in words is "forty billion, four hundred ninety million, six thousand, six hundred eighty-one".