378815612369 has 2 divisors, whose sum is σ = 378815612370. Its totient is φ = 378815612368.

The previous prime is 378815612347. The next prime is 378815612443. The reversal of 378815612369 is 963216518873.

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., 371727993025 + 7087619344 = 609695^2 + 84188^2 .

It is a cyclic number.

It is not a de Polignac number, because 378815612369 - 2¹⁶ = 378815546833 is a prime.

It is a super-2 number, since 2×378815612369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (378815612969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189407806184 + 189407806185.

It is an arithmetic number, because the mean of its divisors is an integer number (189407806185).

Almost surely, 2^378815612369 is an apocalyptic number.

It is an amenable number.

378815612369 is a deficient number, since it is larger than the sum of its proper divisors (1).

378815612369 is an equidigital number, since it uses as much as digits as its factorization.

378815612369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 59.

The spelling of 378815612369 in words is "three hundred seventy-eight billion, eight hundred fifteen million, six hundred twelve thousand, three hundred sixty-nine".