665512455 has 16 divisors (see below), whose sum is σ = 1065911904. Its totient is φ = 354576000.

The previous prime is 665512453. The next prime is 665512459. The reversal of 665512455 is 554215566.

It is a happy number.

It is not a de Polignac number, because 665512455 - 2¹ = 665512453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665512453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7296 + ... + 37205.

It is an arithmetic number, because the mean of its divisors is an integer number (66619494).

Almost surely, 2^665512455 is an apocalyptic number.

665512455 is a deficient number, since it is larger than the sum of its proper divisors (400399449).

665512455 is a wasteful number, since it uses less digits than its factorization.

665512455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45506.

The product of its digits is 180000, while the sum is 39.

The square root of 665512455 is about 25797.5280792560. The cubic root of 665512455 is about 873.0760251271.

It can be divided in two parts, 66551 and 2455, that added together give a triangular number (69006 = T₃₇₁).

The spelling of 665512455 in words is "six hundred sixty-five million, five hundred twelve thousand, four hundred fifty-five".