665172223094 has 4 divisors (see below), whose sum is σ = 997758334644. Its totient is φ = 332586111546.

The previous prime is 665172223091. The next prime is 665172223099. The reversal of 665172223094 is 490322271566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665172223091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166293055772 + ... + 166293055775.

It is an arithmetic number, because the mean of its divisors is an integer number (249439583661).

Almost surely, 2^665172223094 is an apocalyptic number.

665172223094 is a deficient number, since it is larger than the sum of its proper divisors (332586111550).

665172223094 is a wasteful number, since it uses less digits than its factorization.

665172223094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332586111549.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 665172223094 in words is "six hundred sixty-five billion, one hundred seventy-two million, two hundred twenty-three thousand, ninety-four".