40105780397 has 2 divisors, whose sum is σ = 40105780398. Its totient is φ = 40105780396.

The previous prime is 40105780391. The next prime is 40105780433. The reversal of 40105780397 is 79308750104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36536793316 + 3568987081 = 191146^2 + 59741^2 .

It is a cyclic number.

It is not a de Polignac number, because 40105780397 - 2¹² = 40105776301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40105780391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20052890198 + 20052890199.

It is an arithmetic number, because the mean of its divisors is an integer number (20052890199).

Almost surely, 2^40105780397 is an apocalyptic number.

It is an amenable number.

40105780397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40105780397 is an equidigital number, since it uses as much as digits as its factorization.

40105780397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 40105780397 in words is "forty billion, one hundred five million, seven hundred eighty thousand, three hundred ninety-seven".