1665798053 has 4 divisors (see below), whose sum is σ = 1710819660. Its totient is φ = 1620776448.

The previous prime is 1665798047. The next prime is 1665798073. The reversal of 1665798053 is 3508975661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 703681729 + 962116324 = 26527^2 + 31018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665798053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665797992 and 1665798010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665798073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22510748 + ... + 22510821.

It is an arithmetic number, because the mean of its divisors is an integer number (427704915).

Almost surely, 2^1665798053 is an apocalyptic number.

It is an amenable number.

1665798053 is a deficient number, since it is larger than the sum of its proper divisors (45021607).

1665798053 is an equidigital number, since it uses as much as digits as its factorization.

1665798053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45021606.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 1665798053 is about 40814.1893586042. The cubic root of 1665798053 is about 1185.4250946288.

The spelling of 1665798053 in words is "one billion, six hundred sixty-five million, seven hundred ninety-eight thousand, fifty-three".