665500005501 has 32 divisors (see below), whose sum is σ = 952888765440. Its totient is φ = 411896669184.

The previous prime is 665500005473. The next prime is 665500005551. The reversal of 665500005501 is 105500005566.

It is not a de Polignac number, because 665500005501 - 2¹⁴ = 665499989117 is a prime.

It is a super-2 number, since 2×665500005501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665500005551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285616 + ... + 1188518.

It is an arithmetic number, because the mean of its divisors is an integer number (29777773920).

Almost surely, 2^665500005501 is an apocalyptic number.

It is an amenable number.

665500005501 is a deficient number, since it is larger than the sum of its proper divisors (287388759939).

665500005501 is a wasteful number, since it uses less digits than its factorization.

665500005501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903185.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 665500005501 in words is "six hundred sixty-five billion, five hundred million, five thousand, five hundred one".