665466664566 has 64 divisors (see below), whose sum is σ = 1530673998336. Its totient is φ = 190900300800.

The previous prime is 665466664561. The next prime is 665466664607.

665466664566 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 665466664497 and 665466664506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665466664561) 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, 2112465 + ... + 2406956.

It is an arithmetic number, because the mean of its divisors is an integer number (23916781224).

Almost surely, 2^665466664566 is an apocalyptic number.

665466664566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

665466664566 is an abundant number, since it is smaller than the sum of its proper divisors (865207333770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665466664566 is a wasteful number, since it uses less digits than its factorization.

665466664566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519557.

The product of its digits is 671846400, while the sum is 66.

The spelling of 665466664566 in words is "six hundred sixty-five billion, four hundred sixty-six million, six hundred sixty-four thousand, five hundred sixty-six".