4090378297561 has 2 divisors, whose sum is σ = 4090378297562. Its totient is φ = 4090378297560.

The previous prime is 4090378297553. The next prime is 4090378297601. The reversal of 4090378297561 is 1657928730904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2611342881225 + 1479035416336 = 1615965^2 + 1216156^2 .

It is a cyclic number.

It is not a de Polignac number, because 4090378297561 - 2³ = 4090378297553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4090378297561.

It is not a weakly prime, because it can be changed into another prime (4090378297501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045189148780 + 2045189148781.

It is an arithmetic number, because the mean of its divisors is an integer number (2045189148781).

It is a 1-persistent number, because it is pandigital, but 2⋅4090378297561 = 8180756595122 is not.

Almost surely, 2^{4090378297561} is an apocalyptic number.

It is an amenable number.

4090378297561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4090378297561 is an equidigital number, since it uses as much as digits as its factorization.

4090378297561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 4090378297561 in words is "four trillion, ninety billion, three hundred seventy-eight million, two hundred ninety-seven thousand, five hundred sixty-one".