665605522735 has 8 divisors (see below), whose sum is σ = 798779856096. Its totient is φ = 532448932320.

The previous prime is 665605522727. The next prime is 665605522741. The reversal of 665605522735 is 537225506566.

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

It is not a de Polignac number, because 665605522735 - 2³ = 665605522727 is a prime.

It is a Duffinian number.

It is a congruent 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, 4353064 + ... + 4503373.

It is an arithmetic number, because the mean of its divisors is an integer number (99847482012).

Almost surely, 2^665605522735 is an apocalyptic number.

665605522735 is a deficient number, since it is larger than the sum of its proper divisors (133174333361).

665605522735 is a wasteful number, since it uses less digits than its factorization.

665605522735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8871473.

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

The spelling of 665605522735 in words is "six hundred sixty-five billion, six hundred five million, five hundred twenty-two thousand, seven hundred thirty-five".