665016101601 has 8 divisors (see below), whose sum is σ = 886705221120. Its totient is φ = 443335524912.

The previous prime is 665016101573. The next prime is 665016101609. The reversal of 665016101601 is 106101610566.

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

It is not a de Polignac number, because 665016101601 - 2¹³ = 665016093409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665016101609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951806 + ... + 2267063.

It is an arithmetic number, because the mean of its divisors is an integer number (110838152640).

Almost surely, 2^665016101601 is an apocalyptic number.

It is an amenable number.

665016101601 is a deficient number, since it is larger than the sum of its proper divisors (221689119519).

665016101601 is a wasteful number, since it uses less digits than its factorization.

665016101601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271415.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 665016101601 in words is "six hundred sixty-five billion, sixteen million, one hundred one thousand, six hundred one".