378681531639 has 8 divisors (see below), whose sum is σ = 505197730560. Its totient is φ = 252309843576.

The previous prime is 378681531623. The next prime is 378681531691. The reversal of 378681531639 is 936135186873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 378681531639 - 2⁴ = 378681531623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378681531439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36121599 + ... + 36132080.

It is an arithmetic number, because the mean of its divisors is an integer number (63149716320).

Almost surely, 2^378681531639 is an apocalyptic number.

378681531639 is a deficient number, since it is larger than the sum of its proper divisors (126516198921).

378681531639 is a wasteful number, since it uses less digits than its factorization.

378681531639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72255429.

The product of its digits is 19595520, while the sum is 60.

The spelling of 378681531639 in words is "three hundred seventy-eight billion, six hundred eighty-one million, five hundred thirty-one thousand, six hundred thirty-nine".