660155705947 has 2 divisors, whose sum is σ = 660155705948. Its totient is φ = 660155705946.

The previous prime is 660155705929. The next prime is 660155705953. The reversal of 660155705947 is 749507551066.

660155705947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660155705947 is a prime.

It is not a weakly prime, because it can be changed into another prime (660155705987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330077852973 + 330077852974.

It is an arithmetic number, because the mean of its divisors is an integer number (330077852974).

Almost surely, 2^660155705947 is an apocalyptic number.

660155705947 is a deficient number, since it is larger than the sum of its proper divisors (1).

660155705947 is an equidigital number, since it uses as much as digits as its factorization.

660155705947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938000, while the sum is 55.

The spelling of 660155705947 in words is "six hundred sixty billion, one hundred fifty-five million, seven hundred five thousand, nine hundred forty-seven".