1665222050 has 54 divisors (see below), whose sum is σ = 3224000403. Its totient is φ = 639888480.

The previous prime is 1665222043. The next prime is 1665222067. The reversal of 1665222050 is 502225661.

It can be written as a sum of positive squares in 5 ways, for example, as 638724529 + 1026497521 = 25273^2 + 32039^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28855.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8367851 + ... + 8368049.

Almost surely, 2^1665222050 is an apocalyptic number.

1665222050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665222050 is a deficient number, since it is larger than the sum of its proper divisors (1558778353).

1665222050 is an equidigital number, since it uses as much as digits as its factorization.

1665222050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1665222050 is about 40807.1323422757. The cubic root of 1665222050 is about 1185.2884459865.

Multiplying 1665222050 by its product of nonzero digits (7200), we get a square (11989598760000 = 3462600²).

The spelling of 1665222050 in words is "one billion, six hundred sixty-five million, two hundred twenty-two thousand, fifty".