378834567649 has 2 divisors, whose sum is σ = 378834567650. Its totient is φ = 378834567648.

The previous prime is 378834567619. The next prime is 378834567851. The reversal of 378834567649 is 946765438873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339236353600 + 39598214049 = 582440^2 + 198993^2 .

It is an emirp because it is prime and its reverse (946765438873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378834567649 - 2¹⁷ = 378834436577 is a prime.

It is not a weakly prime, because it can be changed into another prime (378834567619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189417283824 + 189417283825.

It is an arithmetic number, because the mean of its divisors is an integer number (189417283825).

Almost surely, 2^378834567649 is an apocalyptic number.

It is an amenable number.

378834567649 is a deficient number, since it is larger than the sum of its proper divisors (1).

378834567649 is an equidigital number, since it uses as much as digits as its factorization.

378834567649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 731566080, while the sum is 70.

The spelling of 378834567649 in words is "three hundred seventy-eight billion, eight hundred thirty-four million, five hundred sixty-seven thousand, six hundred forty-nine".