665520535 has 8 divisors (see below), whose sum is σ = 799530336. Its totient is φ = 531812640.

The previous prime is 665520533. The next prime is 665520547. The reversal of 665520535 is 535025566.

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

It is not a de Polignac number, because 665520535 - 2¹ = 665520533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665520494 and 665520503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665520533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70596 + ... + 79465.

It is an arithmetic number, because the mean of its divisors is an integer number (99941292).

Almost surely, 2^665520535 is an apocalyptic number.

665520535 is a deficient number, since it is larger than the sum of its proper divisors (134009801).

665520535 is a wasteful number, since it uses less digits than its factorization.

665520535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150953.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 665520535 is about 25797.6846829323. The cubic root of 665520535 is about 873.0795584573.

The spelling of 665520535 in words is "six hundred sixty-five million, five hundred twenty thousand, five hundred thirty-five".