553163721 has 24 divisors (see below), whose sum is σ = 836865792. Its totient is φ = 324429600.

The previous prime is 553163717. The next prime is 553163729. The reversal of 553163721 is 127361355.

553163721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 553163721 - 2² = 553163717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (553163729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13326 + ... + 35831.

It is an arithmetic number, because the mean of its divisors is an integer number (34869408).

Almost surely, 2^553163721 is an apocalyptic number.

It is an amenable number.

553163721 is a deficient number, since it is larger than the sum of its proper divisors (283702071).

553163721 is a wasteful number, since it uses less digits than its factorization.

553163721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49213 (or 49202 counting only the distinct ones).

The product of its digits is 18900, while the sum is 33.

The square root of 553163721 is about 23519.4328375495. The cubic root of 553163721 is about 820.8892400640.

The spelling of 553163721 in words is "five hundred fifty-three million, one hundred sixty-three thousand, seven hundred twenty-one".