664012733262665 has 8 divisors (see below), whose sum is σ = 796932579423048. Its totient is φ = 531131986938240.

The previous prime is 664012733262647. The next prime is 664012733262691. The reversal of 664012733262665 is 566262337210466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9189404148409 + 654823329114256 = 3031403^2 + 25589516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664012733262665 - 2¹⁸ = 664012733000521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9774921626 + ... + 9774989555.

It is an arithmetic number, because the mean of its divisors is an integer number (99616572427881).

Almost surely, 2^{664012733262665} is an apocalyptic number.

It is an amenable number.

664012733262665 is a deficient number, since it is larger than the sum of its proper divisors (132919846160383).

664012733262665 is a wasteful number, since it uses less digits than its factorization.

664012733262665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19549917979.

The product of its (nonzero) digits is 78382080, while the sum is 59.

The spelling of 664012733262665 in words is "six hundred sixty-four trillion, twelve billion, seven hundred thirty-three million, two hundred sixty-two thousand, six hundred sixty-five".