378909878441 has 2 divisors, whose sum is σ = 378909878442. Its totient is φ = 378909878440.

The previous prime is 378909878357. The next prime is 378909878449. The reversal of 378909878441 is 144878909873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326264870416 + 52645008025 = 571196^2 + 229445^2 .

It is a cyclic number.

It is not a de Polignac number, because 378909878441 - 2²² = 378905684137 is a prime.

It is a super-3 number, since 3×378909878441³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (378909878449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189454939220 + 189454939221.

It is an arithmetic number, because the mean of its divisors is an integer number (189454939221).

Almost surely, 2^378909878441 is an apocalyptic number.

It is an amenable number.

378909878441 is a deficient number, since it is larger than the sum of its proper divisors (1).

378909878441 is an equidigital number, since it uses as much as digits as its factorization.

378909878441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 378909878441 in words is "three hundred seventy-eight billion, nine hundred nine million, eight hundred seventy-eight thousand, four hundred forty-one".