665874553373226 has 12 divisors (see below), whose sum is σ = 1442728198975362. Its totient is φ = 221958184457736.

The previous prime is 665874553373219. The next prime is 665874553373353. The reversal of 665874553373226 is 622373355478566.

665874553373226 is a `hidden beast` number, since 6 + 6 + 5 + 8 + 7 + 4 + 553 + 37 + 32 + 2 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 378203272607601 + 287671280765625 = 19447449^2 + 16960875^2 .

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18496515371461 + ... + 18496515371496.

Almost surely, 2^{665874553373226} is an apocalyptic number.

665874553373226 is an abundant number, since it is smaller than the sum of its proper divisors (776853645602136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665874553373226 is a wasteful number, since it uses less digits than its factorization.

665874553373226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36993030742965 (or 36993030742962 counting only the distinct ones).

The product of its digits is 4572288000, while the sum is 72.

The spelling of 665874553373226 in words is "six hundred sixty-five trillion, eight hundred seventy-four billion, five hundred fifty-three million, three hundred seventy-three thousand, two hundred twenty-six".