438078007691 has 2 divisors, whose sum is σ = 438078007692. Its totient is φ = 438078007690.

The previous prime is 438078007547. The next prime is 438078007721. The reversal of 438078007691 is 196700870834.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 438078007691 - 2³⁸ = 163200100747 is a prime.

It is not a weakly prime, because it can be changed into another prime (438078003691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219039003845 + 219039003846.

It is an arithmetic number, because the mean of its divisors is an integer number (219039003846).

Almost surely, 2^438078007691 is an apocalyptic number.

438078007691 is a deficient number, since it is larger than the sum of its proper divisors (1).

438078007691 is an equidigital number, since it uses as much as digits as its factorization.

438078007691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 438078007691 in words is "four hundred thirty-eight billion, seventy-eight million, seven thousand, six hundred ninety-one".