1633221265 has 16 divisors (see below), whose sum is σ = 2162106576. Its totient is φ = 1176652800.

The previous prime is 1633221241. The next prime is 1633221269. The reversal of 1633221265 is 5621223361.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 715616001 + 917605264 = 26751^2 + 30292^2 .

It is not a de Polignac number, because 1633221265 - 2¹⁹ = 1632696977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1633221269) 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, 303756 + ... + 309085.

It is an arithmetic number, because the mean of its divisors is an integer number (135131661).

Almost surely, 2^1633221265 is an apocalyptic number.

It is an amenable number.

1633221265 is a deficient number, since it is larger than the sum of its proper divisors (528885311).

1633221265 is a wasteful number, since it uses less digits than its factorization.

1633221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612900.

The product of its digits is 12960, while the sum is 31.

The square root of 1633221265 is about 40413.1323334383. The cubic root of 1633221265 is about 1177.6466707247.

The spelling of 1633221265 in words is "one billion, six hundred thirty-three million, two hundred twenty-one thousand, two hundred sixty-five".