378966557 has 2 divisors, whose sum is σ = 378966558. Its totient is φ = 378966556.

The previous prime is 378966551. The next prime is 378966559. The reversal of 378966557 is 755669873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298218361 + 80748196 = 17269^2 + 8986^2 .

It is a cyclic number.

It is not a de Polignac number, because 378966557 - 2⁴ = 378966541 is a prime.

Together with 378966559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378966551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189483278 + 189483279.

It is an arithmetic number, because the mean of its divisors is an integer number (189483279).

Almost surely, 2^378966557 is an apocalyptic number.

It is an amenable number.

378966557 is a deficient number, since it is larger than the sum of its proper divisors (1).

378966557 is an equidigital number, since it uses as much as digits as its factorization.

378966557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9525600, while the sum is 56.

The square root of 378966557 is about 19467.0633892223. The cubic root of 378966557 is about 723.6584351058.

The spelling of 378966557 in words is "three hundred seventy-eight million, nine hundred sixty-six thousand, five hundred fifty-seven".