378728621639 has 2 divisors, whose sum is σ = 378728621640. Its totient is φ = 378728621638.

The previous prime is 378728621549. The next prime is 378728621681. The reversal of 378728621639 is 936126827873.

It is a strong prime.

It is an emirp because it is prime and its reverse (936126827873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378728621639 - 2¹² = 378728617543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378728621339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189364310819 + 189364310820.

It is an arithmetic number, because the mean of its divisors is an integer number (189364310820).

Almost surely, 2^378728621639 is an apocalyptic number.

378728621639 is a deficient number, since it is larger than the sum of its proper divisors (1).

378728621639 is an equidigital number, since it uses as much as digits as its factorization.

378728621639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 62.

The spelling of 378728621639 in words is "three hundred seventy-eight billion, seven hundred twenty-eight million, six hundred twenty-one thousand, six hundred thirty-nine".