6221028651601 has 9 divisors (see below), whose sum is σ = 6238434231003. Its totient is φ = 6203671520760.

The previous prime is 6221028651589. The next prime is 6221028651619. The reversal of 6221028651601 is 1061568201226.

The square root of 6221028651601 is 2494199.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1488402440001 + 4732626211600 = 1220001^2 + 2175460^2 .

It is not a de Polignac number, because 6221028651601 - 2³¹ = 6218881167953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6221028651661) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 945298131 + ... + 945304711.

Almost surely, 2^{6221028651601} is an apocalyptic number.

6221028651601 is the 2494199-th square number.

6221028651601 is the 1247100-th centered octagonal number.

It is an amenable number.

6221028651601 is a deficient number, since it is larger than the sum of its proper divisors (17405579402).

6221028651601 is an frugal number, since it uses more digits than its factorization.

6221028651601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13920 (or 6960 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 6221028651601 in words is "six trillion, two hundred twenty-one billion, twenty-eight million, six hundred fifty-one thousand, six hundred one".