665640074345 has 8 divisors (see below), whose sum is σ = 798812209800. Its totient is φ = 532482645760.

The previous prime is 665640074329. The next prime is 665640074371. The reversal of 665640074345 is 543470046566.

It can be written as a sum of positive squares in 4 ways, for example, as 130546361344 + 535093713001 = 361312^2 + 731501^2 .

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

It is not a de Polignac number, because 665640074345 - 2⁴ = 665640074329 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665640074293 and 665640074302.

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, 3576896 + ... + 3758385.

It is an arithmetic number, because the mean of its divisors is an integer number (99851526225).

Almost surely, 2^665640074345 is an apocalyptic number.

It is an amenable number.

665640074345 is a deficient number, since it is larger than the sum of its proper divisors (133172135455).

665640074345 is a wasteful number, since it uses less digits than its factorization.

665640074345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7353435.

The product of its (nonzero) digits is 7257600, while the sum is 50.

The spelling of 665640074345 in words is "six hundred sixty-five billion, six hundred forty million, seventy-four thousand, three hundred forty-five".