791873666 has 4 divisors (see below), whose sum is σ = 1187810502. Its totient is φ = 395936832.

The previous prime is 791873639. The next prime is 791873707. The reversal of 791873666 is 666378197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666378197 = 1289 ⋅516973.

It can be written as a sum of positive squares in only one way, i.e., 735548641 + 56325025 = 27121^2 + 7505^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197968415 + ... + 197968418.

Almost surely, 2^791873666 is an apocalyptic number.

791873666 is a deficient number, since it is larger than the sum of its proper divisors (395936836).

791873666 is a wasteful number, since it uses less digits than its factorization.

791873666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395936835.

The product of its digits is 2286144, while the sum is 53.

The square root of 791873666 is about 28140.2499278169. The cubic root of 791873666 is about 925.1638048353.

The spelling of 791873666 in words is "seven hundred ninety-one million, eight hundred seventy-three thousand, six hundred sixty-six".