378813533309 has 2 divisors, whose sum is σ = 378813533310. Its totient is φ = 378813533308.

The previous prime is 378813533281. The next prime is 378813533377. The reversal of 378813533309 is 903335318873.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336309526084 + 42504007225 = 579922^2 + 206165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378813533309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378813533209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189406766654 + 189406766655.

It is an arithmetic number, because the mean of its divisors is an integer number (189406766655).

Almost surely, 2^378813533309 is an apocalyptic number.

It is an amenable number.

378813533309 is a deficient number, since it is larger than the sum of its proper divisors (1).

378813533309 is an equidigital number, since it uses as much as digits as its factorization.

378813533309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 53.

The spelling of 378813533309 in words is "three hundred seventy-eight billion, eight hundred thirteen million, five hundred thirty-three thousand, three hundred nine".