40154949426209 has 2 divisors, whose sum is σ = 40154949426210. Its totient is φ = 40154949426208.

The previous prime is 40154949426139. The next prime is 40154949426233. The reversal of 40154949426209 is 90262494945104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39875878120225 + 279071305984 = 6314735^2 + 528272^2 .

It is a cyclic number.

It is not a de Polignac number, because 40154949426209 - 2¹² = 40154949422113 is a prime.

It is a super-2 number, since 2×40154949426209² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40154949426269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077474713104 + 20077474713105.

It is an arithmetic number, because the mean of its divisors is an integer number (20077474713105).

Almost surely, 2^{40154949426209} is an apocalyptic number.

It is an amenable number.

40154949426209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40154949426209 is an equidigital number, since it uses as much as digits as its factorization.

40154949426209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 59.

The spelling of 40154949426209 in words is "forty trillion, one hundred fifty-four billion, nine hundred forty-nine million, four hundred twenty-six thousand, two hundred nine".