665501645 has 8 divisors (see below), whose sum is σ = 824363520. Its totient is φ = 515226960.

The previous prime is 665501633. The next prime is 665501659. The reversal of 665501645 is 546105566.

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

It is not a de Polignac number, because 665501645 - 2¹⁰ = 665500621 is a prime.

It is a super-3 number, since 3×665501645³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665501599 and 665501608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146625 + ... + 2146934.

It is an arithmetic number, because the mean of its divisors is an integer number (103045440).

Almost surely, 2^665501645 is an apocalyptic number.

It is an amenable number.

665501645 is a deficient number, since it is larger than the sum of its proper divisors (158861875).

665501645 is a wasteful number, since it uses less digits than its factorization.

665501645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293595.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 665501645 is about 25797.3185622072. The cubic root of 665501645 is about 873.0712979413.

The spelling of 665501645 in words is "six hundred sixty-five million, five hundred one thousand, six hundred forty-five".