660323047 has 2 divisors, whose sum is σ = 660323048. Its totient is φ = 660323046.

The previous prime is 660323029. The next prime is 660323057. The reversal of 660323047 is 740323066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660323047 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660323057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330161523 + 330161524.

It is an arithmetic number, because the mean of its divisors is an integer number (330161524).

Almost surely, 2^660323047 is an apocalyptic number.

660323047 is a deficient number, since it is larger than the sum of its proper divisors (1).

660323047 is an equidigital number, since it uses as much as digits as its factorization.

660323047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 660323047 is about 25696.7516818761. The cubic root of 660323047 is about 870.8007983225.

The spelling of 660323047 in words is "six hundred sixty million, three hundred twenty-three thousand, forty-seven".