1668998653 has 6 divisors (see below), whose sum is σ = 1941488286. Its totient is φ = 1430570232.

The previous prime is 1668998651. The next prime is 1668998663. The reversal of 1668998653 is 3568998661.

It can be written as a sum of positive squares in only one way, i.e., 1352621284 + 316377369 = 36778^2 + 17787^2 .

It is not a de Polignac number, because 1668998653 - 2¹ = 1668998651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668998591 and 1668998600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668998651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17030550 + ... + 17030647.

It is an arithmetic number, because the mean of its divisors is an integer number (323581381).

Almost surely, 2^1668998653 is an apocalyptic number.

It is an amenable number.

1668998653 is a deficient number, since it is larger than the sum of its proper divisors (272489633).

1668998653 is an equidigital number, since it uses as much as digits as its factorization.

1668998653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34061211 (or 34061204 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 61.

The square root of 1668998653 is about 40853.3799458503. The cubic root of 1668998653 is about 1186.1838188959.

The spelling of 1668998653 in words is "one billion, six hundred sixty-eight million, nine hundred ninety-eight thousand, six hundred fifty-three".