665105501 has 8 divisors (see below), whose sum is σ = 704975040. Its totient is φ = 625318848.

The previous prime is 665105479. The next prime is 665105543. The reversal of 665105501 is 105501566.

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

It is a cyclic number.

It is not a de Polignac number, because 665105501 - 2¹⁰ = 665104477 is a prime.

It is a super-2 number, since 2×665105501² = 884730654920922002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665105201) 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, 3791 + ... + 36668.

It is an arithmetic number, because the mean of its divisors is an integer number (88121880).

Almost surely, 2^665105501 is an apocalyptic number.

It is an amenable number.

665105501 is a deficient number, since it is larger than the sum of its proper divisors (39869539).

665105501 is a wasteful number, since it uses less digits than its factorization.

665105501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41443.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 665105501 is about 25789.6394119809. The cubic root of 665105501 is about 872.8980298475.

The spelling of 665105501 in words is "six hundred sixty-five million, one hundred five thousand, five hundred one".