1378766630638 has 8 divisors (see below), whose sum is σ = 2069343344088. Its totient is φ = 688985515944.

The previous prime is 1378766630617. The next prime is 1378766630653. The reversal of 1378766630638 is 8360366678731.

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 1378766630638.

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, 198895356 + ... + 198902287.

It is an arithmetic number, because the mean of its divisors is an integer number (258667918011).

Almost surely, 2^{1378766630638} is an apocalyptic number.

1378766630638 is a deficient number, since it is larger than the sum of its proper divisors (690576713450).

1378766630638 is a wasteful number, since it uses less digits than its factorization.

1378766630638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397799378.

The product of its (nonzero) digits is 109734912, while the sum is 64.

The spelling of 1378766630638 in words is "one trillion, three hundred seventy-eight billion, seven hundred sixty-six million, six hundred thirty thousand, six hundred thirty-eight".