40068739631 has 2 divisors, whose sum is σ = 40068739632. Its totient is φ = 40068739630.

The previous prime is 40068739547. The next prime is 40068739639. The reversal of 40068739631 is 13693786004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40068739631 - 2¹⁰ = 40068738607 is a prime.

It is a super-2 number, since 2×40068739631² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40068739639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20034369815 + 20034369816.

It is an arithmetic number, because the mean of its divisors is an integer number (20034369816).

Almost surely, 2^40068739631 is an apocalyptic number.

40068739631 is a deficient number, since it is larger than the sum of its proper divisors (1).

40068739631 is an equidigital number, since it uses as much as digits as its factorization.

40068739631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 40068739631 in words is "forty billion, sixty-eight million, seven hundred thirty-nine thousand, six hundred thirty-one".