380631851818 has 4 divisors (see below), whose sum is σ = 570947777730. Its totient is φ = 190315925908.

The previous prime is 380631851779. The next prime is 380631851867. The reversal of 380631851818 is 818158136083.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818158136083 = 157 ⋅5211198319.

It can be written as a sum of positive squares in only one way, i.e., 323502725529 + 57129126289 = 568773^2 + 239017^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95157962953 + ... + 95157962956.

Almost surely, 2^380631851818 is an apocalyptic number.

380631851818 is a deficient number, since it is larger than the sum of its proper divisors (190315925912).

380631851818 is a wasteful number, since it uses less digits than its factorization.

380631851818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190315925911.

The product of its (nonzero) digits is 1105920, while the sum is 52.

It can be divided in two parts, 38063 and 1851818, that added together give a palindrome (1889881).

The spelling of 380631851818 in words is "three hundred eighty billion, six hundred thirty-one million, eight hundred fifty-one thousand, eight hundred eighteen".