1666979359 has 2 divisors, whose sum is σ = 1666979360. Its totient is φ = 1666979358.

The previous prime is 1666979317. The next prime is 1666979423. The reversal of 1666979359 is 9539796661.

It is a weak prime.

It is an emirp because it is prime and its reverse (9539796661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1666979359 - 2⁹ = 1666978847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666979297 and 1666979306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666979059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833489679 + 833489680.

It is an arithmetic number, because the mean of its divisors is an integer number (833489680).

Almost surely, 2^1666979359 is an apocalyptic number.

1666979359 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666979359 is an equidigital number, since it uses as much as digits as its factorization.

1666979359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16533720, while the sum is 61.

The square root of 1666979359 is about 40828.6585500920. The cubic root of 1666979359 is about 1185.7052444112.

The spelling of 1666979359 in words is "one billion, six hundred sixty-six million, nine hundred seventy-nine thousand, three hundred fifty-nine".