665403453 has 48 divisors (see below), whose sum is σ = 1140572160. Its totient is φ = 368496000.

The previous prime is 665403407. The next prime is 665403461. The reversal of 665403453 is 354304566.

665403453 is a `hidden beast` number, since 66 + 540 + 3 + 4 + 53 = 666.

It is not a de Polignac number, because 665403453 - 2¹⁶ = 665337917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665403493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 127428 + ... + 132546.

It is an arithmetic number, because the mean of its divisors is an integer number (23761920).

Almost surely, 2^665403453 is an apocalyptic number.

It is an amenable number.

665403453 is a deficient number, since it is larger than the sum of its proper divisors (475168707).

665403453 is a wasteful number, since it uses less digits than its factorization.

665403453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250 (or 5247 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 665403453 is about 25795.4153484684. The cubic root of 665403453 is about 873.0283564830.

It can be divided in two parts, 665403 and 453, that added together give a square (665856 = 816²).

The spelling of 665403453 in words is "six hundred sixty-five million, four hundred three thousand, four hundred fifty-three".