665463254405 has 16 divisors (see below), whose sum is σ = 801590340720. Its totient is φ = 530349700608.

The previous prime is 665463254399. The next prime is 665463254459. The reversal of 665463254405 is 504452364566.

It can be written as a sum of positive squares in 8 ways, for example, as 6310872481 + 659152381924 = 79441^2 + 811882^2 .

It is a cyclic number.

It is not a de Polignac number, because 665463254405 - 2¹⁴ = 665463238021 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2484599 + ... + 2739371.

It is an arithmetic number, because the mean of its divisors is an integer number (50099396295).

Almost surely, 2^665463254405 is an apocalyptic number.

It is an amenable number.

665463254405 is a deficient number, since it is larger than the sum of its proper divisors (136127086315).

665463254405 is a wasteful number, since it uses less digits than its factorization.

665463254405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256760.

The product of its (nonzero) digits is 10368000, while the sum is 50.

The spelling of 665463254405 in words is "six hundred sixty-five billion, four hundred sixty-three million, two hundred fifty-four thousand, four hundred five".