665613471 has 8 divisors (see below), whose sum is σ = 887662000. Its totient is φ = 443653632.

The previous prime is 665613439. The next prime is 665613479. The reversal of 665613471 is 174316566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665613471 - 2⁵ = 665613439 is a prime.

It is a super-3 number, since 3×665613471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665613479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050 + ... + 36543.

It is an arithmetic number, because the mean of its divisors is an integer number (110957750).

Almost surely, 2^665613471 is an apocalyptic number.

665613471 is a deficient number, since it is larger than the sum of its proper divisors (222048529).

665613471 is a wasteful number, since it uses less digits than its factorization.

665613471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44345.

The product of its digits is 90720, while the sum is 39.

The square root of 665613471 is about 25799.4858669703. The cubic root of 665613471 is about 873.1201966950.

The spelling of 665613471 in words is "six hundred sixty-five million, six hundred thirteen thousand, four hundred seventy-one".