665094074089 has 3 divisors (see below), whose sum is σ = 665094889623. Its totient is φ = 665093258556.

The previous prime is 665094074087. The next prime is 665094074101. The reversal of 665094074089 is 980470490566.

It is a happy number.

The square root of 665094074089 is 815533.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 25241265625 + 639852808464 = 158875^2 + 799908^2 .

It is not a de Polignac number, because 665094074089 - 2¹ = 665094074087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665094074087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 407767 + ... + 1223299.

It is an arithmetic number, because the mean of its divisors is an integer number (221698296541).

Almost surely, 2^665094074089 is an apocalyptic number.

665094074089 is the 815533-rd square number.

665094074089 is the 407767-th centered octagonal number.

It is an amenable number.

665094074089 is a deficient number, since it is larger than the sum of its proper divisors (815534).

665094074089 is an frugal number, since it uses more digits than its factorization.

665094074089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631066 (or 815533 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 665094074089 in words is "six hundred sixty-five billion, ninety-four million, seventy-four thousand, eighty-nine".