1662806643 has 16 divisors (see below), whose sum is σ = 2335101696. Its totient is φ = 1050426080.

The previous prime is 1662806633. The next prime is 1662806647. The reversal of 1662806643 is 3466082661.

1662806643 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1662806643 - 2¹⁷ = 1662675571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1662806595 and 1662806604.

It is not an unprimeable number, because it can be changed into a prime (1662806647) 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, 105228 + ... + 119993.

It is an arithmetic number, because the mean of its divisors is an integer number (145943856).

Almost surely, 2^1662806643 is an apocalyptic number.

1662806643 is a deficient number, since it is larger than the sum of its proper divisors (672295053).

1662806643 is a wasteful number, since it uses less digits than its factorization.

1662806643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225354.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 1662806643 is about 40777.5262001019. The cubic root of 1662806643 is about 1184.7150811379.

The spelling of 1662806643 in words is "one billion, six hundred sixty-two million, eight hundred six thousand, six hundred forty-three".