1659726947 has 2 divisors, whose sum is σ = 1659726948. Its totient is φ = 1659726946.

The previous prime is 1659726923. The next prime is 1659726961. The reversal of 1659726947 is 7496279561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1659726947 - 2⁶ = 1659726883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1659726892 and 1659726901.

It is not a weakly prime, because it can be changed into another prime (1659726907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 829863473 + 829863474.

It is an arithmetic number, because the mean of its divisors is an integer number (829863474).

Almost surely, 2^1659726947 is an apocalyptic number.

1659726947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1659726947 is an equidigital number, since it uses as much as digits as its factorization.

1659726947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 56.

The square root of 1659726947 is about 40739.7465259665. The cubic root of 1659726947 is about 1183.9832227181.

The spelling of 1659726947 in words is "one billion, six hundred fifty-nine million, seven hundred twenty-six thousand, nine hundred forty-seven".