378221245957 has 2 divisors, whose sum is σ = 378221245958. Its totient is φ = 378221245956.

The previous prime is 378221245951. The next prime is 378221245993. The reversal of 378221245957 is 759542122873.

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., 350616752641 + 27604493316 = 592129^2 + 166146^2 .

It is an emirp because it is prime and its reverse (759542122873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378221245957 - 2¹⁵ = 378221213189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 378221245898 and 378221245907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378221245951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189110622978 + 189110622979.

It is an arithmetic number, because the mean of its divisors is an integer number (189110622979).

Almost surely, 2^378221245957 is an apocalyptic number.

It is an amenable number.

378221245957 is a deficient number, since it is larger than the sum of its proper divisors (1).

378221245957 is an equidigital number, since it uses as much as digits as its factorization.

378221245957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 55.

The spelling of 378221245957 in words is "three hundred seventy-eight billion, two hundred twenty-one million, two hundred forty-five thousand, nine hundred fifty-seven".