1381073666 has 16 divisors (see below), whose sum is σ = 2375642304. Its totient is φ = 589866864.

The previous prime is 1381073587. The next prime is 1381073669. The reversal of 1381073666 is 6663701831.

It is not an unprimeable number, because it can be changed into a prime (1381073669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164240 + ... + 172443.

It is an arithmetic number, because the mean of its divisors is an integer number (148477644).

Almost surely, 2^1381073666 is an apocalyptic number.

1381073666 is a deficient number, since it is larger than the sum of its proper divisors (994568638).

1381073666 is a wasteful number, since it uses less digits than its factorization.

1381073666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336985.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1381073666 is about 37162.7994908887. The cubic root of 1381073666 is about 1113.6249388746.

The spelling of 1381073666 in words is "one billion, three hundred eighty-one million, seventy-three thousand, six hundred sixty-six".