378874161521 has 2 divisors, whose sum is σ = 378874161522. Its totient is φ = 378874161520.

The previous prime is 378874161493. The next prime is 378874161583. The reversal of 378874161521 is 125161478873.

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., 378397219600 + 476941921 = 615140^2 + 21839^2 .

It is a cyclic number.

It is not a de Polignac number, because 378874161521 - 2³⁰ = 377800419697 is a prime.

It is not a weakly prime, because it can be changed into another prime (378874160521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189437080760 + 189437080761.

It is an arithmetic number, because the mean of its divisors is an integer number (189437080761).

Almost surely, 2^378874161521 is an apocalyptic number.

It is an amenable number.

378874161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

378874161521 is an equidigital number, since it uses as much as digits as its factorization.

378874161521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 53.

The spelling of 378874161521 in words is "three hundred seventy-eight billion, eight hundred seventy-four million, one hundred sixty-one thousand, five hundred twenty-one".