1668771047 has 16 divisors (see below), whose sum is σ = 1726002432. Its totient is φ = 1612484160.

The previous prime is 1668771019. The next prime is 1668771059. The reversal of 1668771047 is 7401778661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1668771047 - 2⁸ = 1668770791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668770992 and 1668771010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668761047) 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, 2017448 + ... + 2018274.

It is an arithmetic number, because the mean of its divisors is an integer number (107875152).

Almost surely, 2^1668771047 is an apocalyptic number.

1668771047 is a deficient number, since it is larger than the sum of its proper divisors (57231385).

1668771047 is a wasteful number, since it uses less digits than its factorization.

1668771047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 1668771047 is about 40850.5942062046. The cubic root of 1668771047 is about 1186.1298953797.

The spelling of 1668771047 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-one thousand, forty-seven".