40203556397 has 2 divisors, whose sum is σ = 40203556398. Its totient is φ = 40203556396.

The previous prime is 40203556381. The next prime is 40203556423. The reversal of 40203556397 is 79365530204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22276756516 + 17926799881 = 149254^2 + 133891^2 .

It is a cyclic number.

It is not a de Polignac number, because 40203556397 - 2⁴ = 40203556381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40203558397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20101778198 + 20101778199.

It is an arithmetic number, because the mean of its divisors is an integer number (20101778199).

Almost surely, 2^40203556397 is an apocalyptic number.

It is an amenable number.

40203556397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40203556397 is an equidigital number, since it uses as much as digits as its factorization.

40203556397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 40203556397 in words is "forty billion, two hundred three million, five hundred fifty-six thousand, three hundred ninety-seven".