381669693778 has 8 divisors (see below), whose sum is σ = 574541924220. Its totient is φ = 190155719040.

The previous prime is 381669693751. The next prime is 381669693791. The reversal of 381669693778 is 877396966183.

It can be written as a sum of positive squares in 2 ways, for example, as 300252490209 + 81417203569 = 547953^2 + 285337^2 .

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 381669693778.

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, 339563223 + ... + 339564346.

Almost surely, 2^381669693778 is an apocalyptic number.

381669693778 is a deficient number, since it is larger than the sum of its proper divisors (192872230442).

381669693778 is a wasteful number, since it uses less digits than its factorization.

381669693778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679127852.

The product of its digits is 493807104, while the sum is 73.

The spelling of 381669693778 in words is "three hundred eighty-one billion, six hundred sixty-nine million, six hundred ninety-three thousand, seven hundred seventy-eight".