665378022529 has 8 divisors (see below), whose sum is σ = 726128352288. Its totient is φ = 604671262560.

The previous prime is 665378022479. The next prime is 665378022539. The reversal of 665378022529 is 925220873566.

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 665378022529 - 2¹⁵ = 665377989761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665378022529.

It is not an unprimeable number, because it can be changed into a prime (665378022539) 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, 10860507 + ... + 10921600.

It is an arithmetic number, because the mean of its divisors is an integer number (90766044036).

Almost surely, 2^665378022529 is an apocalyptic number.

It is an amenable number.

665378022529 is a deficient number, since it is larger than the sum of its proper divisors (60750329759).

665378022529 is a wasteful number, since it uses less digits than its factorization.

665378022529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21784895.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 665378022529 in words is "six hundred sixty-five billion, three hundred seventy-eight million, twenty-two thousand, five hundred twenty-nine".