378689689861 has 4 divisors (see below), whose sum is σ = 432788216992. Its totient is φ = 324591162732.

The previous prime is 378689689801. The next prime is 378689689867. The reversal of 378689689861 is 168986986873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168986986873 = 69389 ⋅2435357.

It is a cyclic number.

It is not a de Polignac number, because 378689689861 - 2²⁹ = 378152818949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378689689867) 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, 27049263555 + ... + 27049263568.

It is an arithmetic number, because the mean of its divisors is an integer number (108197054248).

Almost surely, 2^378689689861 is an apocalyptic number.

It is an amenable number.

378689689861 is a deficient number, since it is larger than the sum of its proper divisors (54098527131).

378689689861 is an equidigital number, since it uses as much as digits as its factorization.

378689689861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54098527130.

The product of its digits is 1504935936, while the sum is 79.

The spelling of 378689689861 in words is "three hundred seventy-eight billion, six hundred eighty-nine million, six hundred eighty-nine thousand, eight hundred sixty-one".