378763965421 has 4 divisors (see below), whose sum is σ = 378765197692. Its totient is φ = 378762733152.

The previous prime is 378763965413. The next prime is 378763965451. The reversal of 378763965421 is 124569367873.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124569367873 = 3617 ⋅34439969.

It can be written as a sum of positive squares in 2 ways, for example, as 246002112196 + 132761853225 = 495986^2 + 364365^2 .

It is a cyclic number.

It is not a de Polignac number, because 378763965421 - 2³ = 378763965413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378763965421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378763965451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264121 + ... + 909553.

It is an arithmetic number, because the mean of its divisors is an integer number (94691299423).

Almost surely, 2^378763965421 is an apocalyptic number.

It is an amenable number.

378763965421 is a deficient number, since it is larger than the sum of its proper divisors (1232271).

378763965421 is an equidigital number, since it uses as much as digits as its factorization.

378763965421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232270.

The product of its digits is 45722880, while the sum is 61.

The spelling of 378763965421 in words is "three hundred seventy-eight billion, seven hundred sixty-three million, nine hundred sixty-five thousand, four hundred twenty-one".