40405206851749 has 2 divisors, whose sum is σ = 40405206851750. Its totient is φ = 40405206851748.

The previous prime is 40405206851699. The next prime is 40405206851759. The reversal of 40405206851749 is 94715860250404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21019519937025 + 19385686914724 = 4584705^2 + 4402918^2 .

It is a cyclic number.

It is not a de Polignac number, because 40405206851749 - 2¹⁷ = 40405206720677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40405206851749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40405206851759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202603425874 + 20202603425875.

It is an arithmetic number, because the mean of its divisors is an integer number (20202603425875).

Almost surely, 2^{40405206851749} is an apocalyptic number.

It is an amenable number.

40405206851749 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405206851749 is an equidigital number, since it uses as much as digits as its factorization.

40405206851749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 40405206851749 in words is "forty trillion, four hundred five billion, two hundred six million, eight hundred fifty-one thousand, seven hundred forty-nine".