673065521 has 16 divisors (see below), whose sum is σ = 721287168. Its totient is φ = 626961600.

The previous prime is 673065493. The next prime is 673065527. The reversal of 673065521 is 125560376.

It is a cyclic number.

It is not a de Polignac number, because 673065521 - 2¹⁴ = 673049137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673065527) 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, 85091 + ... + 92663.

It is an arithmetic number, because the mean of its divisors is an integer number (45080448).

Almost surely, 2^673065521 is an apocalyptic number.

673065521 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

673065521 is a deficient number, since it is larger than the sum of its proper divisors (48221647).

673065521 is a wasteful number, since it uses less digits than its factorization.

673065521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7712.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 673065521 is about 25943.5063358830. The cubic root of 673065521 is about 876.3665269264.

It can be divided in two parts, 67306 and 5521, that added together give a palindrome (72827).

The spelling of 673065521 in words is "six hundred seventy-three million, sixty-five thousand, five hundred twenty-one".