1138157666 has 8 divisors (see below), whose sum is σ = 1753378140. Its totient is φ = 553698288.

The previous prime is 1138157659. The next prime is 1138157689. The reversal of 1138157666 is 6667518311.

It can be written as a sum of positive squares in 2 ways, for example, as 941569225 + 196588441 = 30685^2 + 14021^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7690181 + ... + 7690328.

Almost surely, 2^1138157666 is an apocalyptic number.

1138157666 is a deficient number, since it is larger than the sum of its proper divisors (615220474).

1138157666 is a wasteful number, since it uses less digits than its factorization.

1138157666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380548.

The product of its digits is 181440, while the sum is 44.

The square root of 1138157666 is about 33736.5923886809. The cubic root of 1138157666 is about 1044.0808798288.

The spelling of 1138157666 in words is "one billion, one hundred thirty-eight million, one hundred fifty-seven thousand, six hundred sixty-six".