16378452638 has 8 divisors (see below), whose sum is σ = 24761125632. Its totient is φ = 8124744096.

The previous prime is 16378452617. The next prime is 16378452683. The reversal of 16378452638 is 83625487361.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 16378452638.

It is a congruent 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, 32240795 + ... + 32241302.

It is an arithmetic number, because the mean of its divisors is an integer number (3095140704).

Almost surely, 2^16378452638 is an apocalyptic number.

16378452638 is a deficient number, since it is larger than the sum of its proper divisors (8382672994).

16378452638 is a wasteful number, since it uses less digits than its factorization.

16378452638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64482226.

The product of its digits is 5806080, while the sum is 53.

The spelling of 16378452638 in words is "sixteen billion, three hundred seventy-eight million, four hundred fifty-two thousand, six hundred thirty-eight".