40306216649 has 2 divisors, whose sum is σ = 40306216650. Its totient is φ = 40306216648.

The previous prime is 40306216571. The next prime is 40306216667. The reversal of 40306216649 is 94661260304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39439974025 + 866242624 = 198595^2 + 29432^2 .

It is a cyclic number.

It is not a de Polignac number, because 40306216649 - 2¹² = 40306212553 is a prime.

It is a super-2 number, since 2×40306216649² (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 (40306216549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20153108324 + 20153108325.

It is an arithmetic number, because the mean of its divisors is an integer number (20153108325).

Almost surely, 2^40306216649 is an apocalyptic number.

It is an amenable number.

40306216649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40306216649 is an equidigital number, since it uses as much as digits as its factorization.

40306216649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 40306216649 in words is "forty billion, three hundred six million, two hundred sixteen thousand, six hundred forty-nine".