1662644441 has 4 divisors (see below), whose sum is σ = 1662897972. Its totient is φ = 1662390912.

The previous prime is 1662644383. The next prime is 1662644449. The reversal of 1662644441 is 1444462661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1444462661 = 241 ⋅5993621.

It can be written as a sum of positive squares in 2 ways, for example, as 1169982025 + 492662416 = 34205^2 + 22196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662644441 - 2⁶ = 1662644377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1662644395 and 1662644404.

It is not an unprimeable number, because it can be changed into a prime (1662644449) 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, 116660 + ... + 130133.

It is an arithmetic number, because the mean of its divisors is an integer number (415724493).

Almost surely, 2^1662644441 is an apocalyptic number.

It is an amenable number.

1662644441 is a deficient number, since it is larger than the sum of its proper divisors (253531).

1662644441 is an equidigital number, since it uses as much as digits as its factorization.

1662644441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253530.

The product of its digits is 110592, while the sum is 38.

The square root of 1662644441 is about 40775.5372864663. The cubic root of 1662644441 is about 1184.6765580370.

The spelling of 1662644441 in words is "one billion, six hundred sixty-two million, six hundred forty-four thousand, four hundred forty-one".