665476791 has 12 divisors (see below), whose sum is σ = 1032168312. Its totient is φ = 380272368.

The previous prime is 665476771. The next prime is 665476811. The reversal of 665476791 is 197674566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665476771) and next prime (665476811).

It is not a de Polignac number, because 665476791 - 2⁷ = 665476663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665476771) 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 11 ways as a sum of consecutive naturals, for example, 2263380 + ... + 2263673.

It is an arithmetic number, because the mean of its divisors is an integer number (86014026).

Almost surely, 2^665476791 is an apocalyptic number.

665476791 is a deficient number, since it is larger than the sum of its proper divisors (366691521).

665476791 is a wasteful number, since it uses less digits than its factorization.

665476791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527070 (or 4527063 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 665476791 is about 25796.8368409772. The cubic root of 665476791 is about 873.0604291557.

The spelling of 665476791 in words is "six hundred sixty-five million, four hundred seventy-six thousand, seven hundred ninety-one".