378470386819781 has 2 divisors, whose sum is σ = 378470386819782. Its totient is φ = 378470386819780.

The previous prime is 378470386819729. The next prime is 378470386819801. The reversal of 378470386819781 is 187918683074873.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190190550139681 + 188279836680100 = 13790959^2 + 13721510^2 .

It is a cyclic number.

It is not a de Polignac number, because 378470386819781 - 2⁴⁶ = 308101642642117 is a prime.

It is a super-2 number, since 2×378470386819781² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 378470386819696 and 378470386819705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378470386819711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189235193409890 + 189235193409891.

It is an arithmetic number, because the mean of its divisors is an integer number (189235193409891).

Almost surely, 2^{378470386819781} is an apocalyptic number.

It is an amenable number.

378470386819781 is a deficient number, since it is larger than the sum of its proper divisors (1).

378470386819781 is an equidigital number, since it uses as much as digits as its factorization.

378470386819781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2731180032, while the sum is 80.

The spelling of 378470386819781 in words is "three hundred seventy-eight trillion, four hundred seventy billion, three hundred eighty-six million, eight hundred nineteen thousand, seven hundred eighty-one".