381618266 has 4 divisors (see below), whose sum is σ = 572427402. Its totient is φ = 190809132.

The previous prime is 381618253. The next prime is 381618271. The reversal of 381618266 is 662816183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 298425625 + 83192641 = 17275^2 + 9121^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95404565 + ... + 95404568.

Almost surely, 2^381618266 is an apocalyptic number.

381618266 is a deficient number, since it is larger than the sum of its proper divisors (190809136).

381618266 is a wasteful number, since it uses less digits than its factorization.

381618266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190809135.

The product of its digits is 82944, while the sum is 41.

The square root of 381618266 is about 19535.0522395002. The cubic root of 381618266 is about 725.3423771711.

The spelling of 381618266 in words is "three hundred eighty-one million, six hundred eighteen thousand, two hundred sixty-six".