665357605522 has 8 divisors (see below), whose sum is σ = 998047135116. Its totient is φ = 332675227152.

The previous prime is 665357605477. The next prime is 665357605547. The reversal of 665357605522 is 225506753566.

It can be written as a sum of positive squares in 2 ways, for example, as 441731707641 + 223625897881 = 664629^2 + 472891^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 665357605522.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548813 + ... + 1931200.

Almost surely, 2^665357605522 is an apocalyptic number.

665357605522 is a deficient number, since it is larger than the sum of its proper divisors (332689529594).

665357605522 is a wasteful number, since it uses less digits than its factorization.

665357605522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575612.

The product of its (nonzero) digits is 11340000, while the sum is 52.

The spelling of 665357605522 in words is "six hundred sixty-five billion, three hundred fifty-seven million, six hundred five thousand, five hundred twenty-two".