1666060647 has 4 divisors (see below), whose sum is σ = 2221414200. Its totient is φ = 1110707096.

The previous prime is 1666060631. The next prime is 1666060663. The reversal of 1666060647 is 7460606661.

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

It is an interprime number because it is at equal distance from previous prime (1666060631) and next prime (1666060663).

It is a cyclic number.

It is not a de Polignac number, because 1666060647 - 2⁴ = 1666060631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666060599 and 1666060608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666060147) 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, 277676772 + ... + 277676777.

It is an arithmetic number, because the mean of its divisors is an integer number (555353550).

Almost surely, 2^1666060647 is an apocalyptic number.

1666060647 is a deficient number, since it is larger than the sum of its proper divisors (555353553).

1666060647 is an equidigital number, since it uses as much as digits as its factorization.

1666060647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555353552.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 1666060647 is about 40817.4061767771. The cubic root of 1666060647 is about 1185.4873809228.

The spelling of 1666060647 in words is "one billion, six hundred sixty-six million, sixty thousand, six hundred forty-seven".