675537721 has 16 divisors (see below), whose sum is σ = 732188160. Its totient is φ = 620830720.

The previous prime is 675537719. The next prime is 675537727. The reversal of 675537721 is 127735576.

It is a cyclic number.

It is not a de Polignac number, because 675537721 - 2¹ = 675537719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (675537727) 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, 511500 + ... + 512818.

It is an arithmetic number, because the mean of its divisors is an integer number (45761760).

Almost surely, 2^675537721 is an apocalyptic number.

It is an amenable number.

675537721 is a deficient number, since it is larger than the sum of its proper divisors (56650439).

675537721 is a wasteful number, since it uses less digits than its factorization.

675537721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024.

The product of its digits is 308700, while the sum is 43.

The square root of 675537721 is about 25991.1084988694. The cubic root of 675537721 is about 877.4381938216.

The spelling of 675537721 in words is "six hundred seventy-five million, five hundred thirty-seven thousand, seven hundred twenty-one".