378815630785 has 4 divisors (see below), whose sum is σ = 454578756948. Its totient is φ = 303052504624.

The previous prime is 378815630761. The next prime is 378815630803. The reversal of 378815630785 is 587036518873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587036518873 = 7 ⋅83862359839.

It can be written as a sum of positive squares in 2 ways, for example, as 64921001616 + 313894629169 = 254796^2 + 560263^2 .

It is a cyclic number.

It is not a de Polignac number, because 378815630785 - 2²¹ = 378813533633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 37881563074 + ... + 37881563083.

It is an arithmetic number, because the mean of its divisors is an integer number (113644689237).

Almost surely, 2^378815630785 is an apocalyptic number.

It is an amenable number.

378815630785 is a deficient number, since it is larger than the sum of its proper divisors (75763126163).

378815630785 is an equidigital number, since it uses as much as digits as its factorization.

378815630785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75763126162.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 378815630785 in words is "three hundred seventy-eight billion, eight hundred fifteen million, six hundred thirty thousand, seven hundred eighty-five".