665470511 has 12 divisors (see below), whose sum is σ = 697021080. Its totient is φ = 634591440.

The previous prime is 665470501. The next prime is 665470529. The reversal of 665470511 is 115074566.

It is not a de Polignac number, because 665470511 - 2¹⁸ = 665208367 is a prime.

It is a super-2 number, since 2×665470511² = 885702002021202242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665470501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198116 + ... + 201446.

It is an arithmetic number, because the mean of its divisors is an integer number (58085090).

Almost surely, 2^665470511 is an apocalyptic number.

665470511 is a deficient number, since it is larger than the sum of its proper divisors (31550569).

665470511 is an equidigital number, since it uses as much as digits as its factorization.

665470511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526 (or 3443 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 665470511 is about 25796.7151203404. The cubic root of 665470511 is about 873.0576828357.

The spelling of 665470511 in words is "six hundred sixty-five million, four hundred seventy thousand, five hundred eleven".