665505474351 has 4 divisors (see below), whose sum is σ = 887340632472. Its totient is φ = 443670316232.

The previous prime is 665505474287. The next prime is 665505474353. The reversal of 665505474351 is 153474505566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 665505474351 - 2⁶ = 665505474287 is a prime.

It is a super-2 number, since 2×665505474351² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665505474294 and 665505474303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665505474353) 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, 110917579056 + ... + 110917579061.

It is an arithmetic number, because the mean of its divisors is an integer number (221835158118).

Almost surely, 2^665505474351 is an apocalyptic number.

665505474351 is a deficient number, since it is larger than the sum of its proper divisors (221835158121).

665505474351 is a wasteful number, since it uses less digits than its factorization.

665505474351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221835158120.

The product of its (nonzero) digits is 7560000, while the sum is 51.

The spelling of 665505474351 in words is "six hundred sixty-five billion, five hundred five million, four hundred seventy-four thousand, three hundred fifty-one".