665576447 has 4 divisors (see below), whose sum is σ = 679737696. Its totient is φ = 651415200.

The previous prime is 665576437. The next prime is 665576453. The reversal of 665576447 is 744675566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744675566 = 2 ⋅372337783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665576447 is a prime.

It is a super-2 number, since 2×665576447² = 885984013602287618, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665576395 and 665576404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665576437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7080554 + ... + 7080647.

It is an arithmetic number, because the mean of its divisors is an integer number (169934424).

Almost surely, 2^665576447 is an apocalyptic number.

665576447 is a deficient number, since it is larger than the sum of its proper divisors (14161249).

665576447 is a wasteful number, since it uses less digits than its factorization.

665576447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14161248.

The product of its digits is 4233600, while the sum is 50.

The square root of 665576447 is about 25798.7683233134. The cubic root of 665576447 is about 873.1040076188.

The spelling of 665576447 in words is "six hundred sixty-five million, five hundred seventy-six thousand, four hundred forty-seven".