378451906517 has 2 divisors, whose sum is σ = 378451906518. Its totient is φ = 378451906516.

The previous prime is 378451906493. The next prime is 378451906523. The reversal of 378451906517 is 715609154873.

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., 217523363236 + 160928543281 = 466394^2 + 401159^2 .

It is a cyclic number.

It is not a de Polignac number, because 378451906517 - 2¹⁰ = 378451905493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378451906817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189225953258 + 189225953259.

It is an arithmetic number, because the mean of its divisors is an integer number (189225953259).

Almost surely, 2^378451906517 is an apocalyptic number.

It is an amenable number.

378451906517 is a deficient number, since it is larger than the sum of its proper divisors (1).

378451906517 is an equidigital number, since it uses as much as digits as its factorization.

378451906517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 378451906517 in words is "three hundred seventy-eight billion, four hundred fifty-one million, nine hundred six thousand, five hundred seventeen".