675563721 has 16 divisors (see below), whose sum is σ = 1035187200. Its totient is φ = 383877648.

The previous prime is 675563711. The next prime is 675563741. The reversal of 675563721 is 127365576.

It is not a de Polignac number, because 675563721 - 2⁶ = 675563657 is a prime.

It is a super-2 number, since 2×675563721² = 912772682262731682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (675563711) 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, 86101 + ... + 93618.

It is an arithmetic number, because the mean of its divisors is an integer number (64699200).

Almost surely, 2^675563721 is an apocalyptic number.

It is an amenable number.

675563721 is a deficient number, since it is larger than the sum of its proper divisors (359623479).

675563721 is a wasteful number, since it uses less digits than its factorization.

675563721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179908.

The product of its digits is 264600, while the sum is 42.

The square root of 675563721 is about 25991.6086651057. The cubic root of 675563721 is about 877.4494505828.

The spelling of 675563721 in words is "six hundred seventy-five million, five hundred sixty-three thousand, seven hundred twenty-one".