665056047 has 4 divisors (see below), whose sum is σ = 886741400. Its totient is φ = 443370696.

The previous prime is 665056027. The next prime is 665056087. The reversal of 665056047 is 740650566.

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

It is not a de Polignac number, because 665056047 - 2⁶ = 665055983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665055996 and 665056014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665056027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110842672 + ... + 110842677.

It is an arithmetic number, because the mean of its divisors is an integer number (221685350).

Almost surely, 2^665056047 is an apocalyptic number.

665056047 is a deficient number, since it is larger than the sum of its proper divisors (221685353).

665056047 is a wasteful number, since it uses less digits than its factorization.

665056047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221685352.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 665056047 is about 25788.6805982780. The cubic root of 665056047 is about 872.8763944984.

The spelling of 665056047 in words is "six hundred sixty-five million, fifty-six thousand, forty-seven".