1666837946 has 16 divisors (see below), whose sum is σ = 2606473728. Its totient is φ = 798546000.

The previous prime is 1666837943. The next prime is 1666838003. The reversal of 1666837946 is 6497386661.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1666837891 and 1666837900.

It is not an unprimeable number, because it can be changed into a prime (1666837943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126830 + ... + 139353.

It is an arithmetic number, because the mean of its divisors is an integer number (162904608).

Almost surely, 2^1666837946 is an apocalyptic number.

1666837946 is a deficient number, since it is larger than the sum of its proper divisors (939635782).

1666837946 is a wasteful number, since it uses less digits than its factorization.

1666837946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266317.

The product of its digits is 7838208, while the sum is 56.

The square root of 1666837946 is about 40826.9267273450. The cubic root of 1666837946 is about 1185.6717149264.

The spelling of 1666837946 in words is "one billion, six hundred sixty-six million, eight hundred thirty-seven thousand, nine hundred forty-six".