665565115000 has 40 divisors (see below), whose sum is σ = 1559419076160. Its totient is φ = 266226044000.

The previous prime is 665565114997. The next prime is 665565115009. The reversal of 665565115000 is 511565566.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665565115009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 66551512 + ... + 66561511.

It is an arithmetic number, because the mean of its divisors is an integer number (38985476904).

Almost surely, 2^665565115000 is an apocalyptic number.

It is an amenable number.

665565115000 is an abundant number, since it is smaller than the sum of its proper divisors (893853961160).

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

665565115000 is a wasteful number, since it uses less digits than its factorization.

665565115000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133113049 (or 133113030 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 665565115000 in words is "six hundred sixty-five billion, five hundred sixty-five million, one hundred fifteen thousand".