1666316047 has 12 divisors (see below), whose sum is σ = 1939312368. Its totient is φ = 1425723200.

The previous prime is 1666316033. The next prime is 1666316101. The reversal of 1666316047 is 7406136661.

It is not a de Polignac number, because 1666316047 - 2¹⁵ = 1666283279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666316347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 402979 + ... + 407092.

It is an arithmetic number, because the mean of its divisors is an integer number (161609364).

Almost surely, 2^1666316047 is an apocalyptic number.

1666316047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1666316047 is a deficient number, since it is larger than the sum of its proper divisors (272996321).

1666316047 is a wasteful number, since it uses less digits than its factorization.

1666316047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810110 (or 810099 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 1666316047 is about 40820.5346241325. The cubic root of 1666316047 is about 1185.5479545495.

It can be divided in two parts, 1666 and 316047, that added together give a palindrome (317713).

The spelling of 1666316047 in words is "one billion, six hundred sixty-six million, three hundred sixteen thousand, forty-seven".